Reland of Make default media device ID salts random by default

Reland of Make default media device ID salts random by default (patchset #1 id:1 of https://codereview.chromium.org/2065383003/ )

Reason for revert:
Creating reland. The problem was a test that gets the salt on the IO thread. It should be changed to the UI thread.

Original issue's description:
> Revert of Make default media device ID salts random by default (patchset #13 id:260001 of https://codereview.chromium.org/1987643002/ )
>
> Reason for revert:
> Reverting because it is breaking the WebRTC MacTester bot.
> https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/55969/
>
> Original issue's description:
> > This results in different hashed device IDs on each session on embedders that don't have a specialized implementation of device ID salts such as WebView, Blimp and Content Shell. The new default helps prevent user fingerprinting on these embedders.
> >
> > Since the new default logic is basically the same as for Chrome incognito mode, Chrome's implementation of salts has been updated to defer to the new default on incognito mode.
> >
> > BUG=315022
> >
> > Committed: https://crrev.com/4db1329e005388540eb07429ac97827ca9bc422b
> > Cr-Commit-Position: refs/heads/master@{#399883}
>
> TBR=jam@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=315022
>
> Committed: https://crrev.com/f72bda81d0c3e6f256826e9ecdf6d745e4ad76c8
> Cr-Commit-Position: refs/heads/master@{#399887}

TBR=jam@chromium.org
BUG=315022
Committed: https://crrev.com/91768ed181acd514b5d57af73477e69e7a927b6e
Cr-Commit-Position: refs/heads/master@{#399902}

[Guido Urdaneta, 2016-06-15 13:40:38]

Created Reland of Make default media device ID salts random by default

[Guido Urdaneta, 2016-06-15 13:41:52]

Description was changed from

==========
Reland of Make default media device ID salts random by default (patchset #1 id:1
of https://codereview.chromium.org/2065383003/ )

Reason for revert:
Creating reland. The problem was a test that gets the salt on the IO thread. It
should be changed to the UI thread.

Original issue's description:
> Revert of Make default media device ID salts random by default (patchset #13
id:260001 of https://codereview.chromium.org/1987643002/ )
> 
> Reason for revert:
> Reverting because it is breaking the WebRTC MacTester bot.
>
https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/55969/
> 
> Original issue's description:
> > This results in different hashed device IDs on each session on embedders
that don't have a specialized implementation of device ID salts such as WebView,
Blimp and Content Shell. The new default helps prevent user fingerprinting on
these embedders.
> >
> > Since the new default logic is basically the same as for Chrome incognito
mode, Chrome's implementation of salts has been updated to defer to the new
default on incognito mode.
> >
> > BUG=315022
> >
> > Committed: https://crrev.com/4db1329e005388540eb07429ac97827ca9bc422b
> > Cr-Commit-Position: refs/heads/master@{#399883}
> 
> TBR=jam@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=315022
> 
> Committed: https://crrev.com/f72bda81d0c3e6f256826e9ecdf6d745e4ad76c8
> Cr-Commit-Position: refs/heads/master@{#399887}

TBR=jam@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=315022
==========

to

==========
Reland of Make default media device ID salts random by default (patchset #1 id:1
of https://codereview.chromium.org/2065383003/ )

Reason for revert:
Creating reland. The problem was a test that gets the salt on the IO thread. It
should be changed to the UI thread.

Original issue's description:
> Revert of Make default media device ID salts random by default (patchset #13
id:260001 of https://codereview.chromium.org/1987643002/ )
> 
> Reason for revert:
> Reverting because it is breaking the WebRTC MacTester bot.
>
https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/55969/
> 
> Original issue's description:
> > This results in different hashed device IDs on each session on embedders
that don't have a specialized implementation of device ID salts such as WebView,
Blimp and Content Shell. The new default helps prevent user fingerprinting on
these embedders.
> >
> > Since the new default logic is basically the same as for Chrome incognito
mode, Chrome's implementation of salts has been updated to defer to the new
default on incognito mode.
> >
> > BUG=315022
> >
> > Committed: https://crrev.com/4db1329e005388540eb07429ac97827ca9bc422b
> > Cr-Commit-Position: refs/heads/master@{#399883}
> 
> TBR=jam@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=315022
> 
> Committed: https://crrev.com/f72bda81d0c3e6f256826e9ecdf6d745e4ad76c8
> Cr-Commit-Position: refs/heads/master@{#399887}

TBR=jam@chromium.org
BUG=315022
==========

[Guido Urdaneta, 2016-06-15 13:45:28]

The CQ bit was checked by guidou@chromium.org

[commit-bot: I haz the power, 2016-06-15 13:45:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2068103003/310001

[Guido Urdaneta, 2016-06-15 13:48:50]

PS1 contains the originally landed code.
PS2 contains the fix, which is substiting UI for IO on the function that calls
GetMediaDeviceIDSalt() in webrtc_audio_private_browserttest.cc

[commit-bot: I haz the power, 2016-06-15 15:50:06]

Description was changed from

==========
Reland of Make default media device ID salts random by default (patchset #1 id:1
of https://codereview.chromium.org/2065383003/ )

Reason for revert:
Creating reland. The problem was a test that gets the salt on the IO thread. It
should be changed to the UI thread.

Original issue's description:
> Revert of Make default media device ID salts random by default (patchset #13
id:260001 of https://codereview.chromium.org/1987643002/ )
> 
> Reason for revert:
> Reverting because it is breaking the WebRTC MacTester bot.
>
https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/55969/
> 
> Original issue's description:
> > This results in different hashed device IDs on each session on embedders
that don't have a specialized implementation of device ID salts such as WebView,
Blimp and Content Shell. The new default helps prevent user fingerprinting on
these embedders.
> >
> > Since the new default logic is basically the same as for Chrome incognito
mode, Chrome's implementation of salts has been updated to defer to the new
default on incognito mode.
> >
> > BUG=315022
> >
> > Committed: https://crrev.com/4db1329e005388540eb07429ac97827ca9bc422b
> > Cr-Commit-Position: refs/heads/master@{#399883}
> 
> TBR=jam@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=315022
> 
> Committed: https://crrev.com/f72bda81d0c3e6f256826e9ecdf6d745e4ad76c8
> Cr-Commit-Position: refs/heads/master@{#399887}

TBR=jam@chromium.org
BUG=315022
==========

to

==========
Reland of Make default media device ID salts random by default (patchset #1 id:1
of https://codereview.chromium.org/2065383003/ )

Reason for revert:
Creating reland. The problem was a test that gets the salt on the IO thread. It
should be changed to the UI thread.

Original issue's description:
> Revert of Make default media device ID salts random by default (patchset #13
id:260001 of https://codereview.chromium.org/1987643002/ )
> 
> Reason for revert:
> Reverting because it is breaking the WebRTC MacTester bot.
>
https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/55969/
> 
> Original issue's description:
> > This results in different hashed device IDs on each session on embedders
that don't have a specialized implementation of device ID salts such as WebView,
Blimp and Content Shell. The new default helps prevent user fingerprinting on
these embedders.
> >
> > Since the new default logic is basically the same as for Chrome incognito
mode, Chrome's implementation of salts has been updated to defer to the new
default on incognito mode.
> >
> > BUG=315022
> >
> > Committed: https://crrev.com/4db1329e005388540eb07429ac97827ca9bc422b
> > Cr-Commit-Position: refs/heads/master@{#399883}
> 
> TBR=jam@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=315022
> 
> Committed: https://crrev.com/f72bda81d0c3e6f256826e9ecdf6d745e4ad76c8
> Cr-Commit-Position: refs/heads/master@{#399887}

TBR=jam@chromium.org
BUG=315022
==========

[commit-bot: I haz the power, 2016-06-15 15:50:08]

Committed patchset #2 (id:310001)

[commit-bot: I haz the power, 2016-06-15 15:50:12]

CQ bit was unchecked

[commit-bot: I haz the power, 2016-06-15 15:51:34]

Description was changed from

==========
Reland of Make default media device ID salts random by default (patchset #1 id:1
of https://codereview.chromium.org/2065383003/ )

Reason for revert:
Creating reland. The problem was a test that gets the salt on the IO thread. It
should be changed to the UI thread.

Original issue's description:
> Revert of Make default media device ID salts random by default (patchset #13
id:260001 of https://codereview.chromium.org/1987643002/ )
> 
> Reason for revert:
> Reverting because it is breaking the WebRTC MacTester bot.
>
https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/55969/
> 
> Original issue's description:
> > This results in different hashed device IDs on each session on embedders
that don't have a specialized implementation of device ID salts such as WebView,
Blimp and Content Shell. The new default helps prevent user fingerprinting on
these embedders.
> >
> > Since the new default logic is basically the same as for Chrome incognito
mode, Chrome's implementation of salts has been updated to defer to the new
default on incognito mode.
> >
> > BUG=315022
> >
> > Committed: https://crrev.com/4db1329e005388540eb07429ac97827ca9bc422b
> > Cr-Commit-Position: refs/heads/master@{#399883}
> 
> TBR=jam@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=315022
> 
> Committed: https://crrev.com/f72bda81d0c3e6f256826e9ecdf6d745e4ad76c8
> Cr-Commit-Position: refs/heads/master@{#399887}

TBR=jam@chromium.org
BUG=315022
==========

to

==========
Reland of Make default media device ID salts random by default (patchset #1 id:1
of https://codereview.chromium.org/2065383003/ )

Reason for revert:
Creating reland. The problem was a test that gets the salt on the IO thread. It
should be changed to the UI thread.

Original issue's description:
> Revert of Make default media device ID salts random by default (patchset #13
id:260001 of https://codereview.chromium.org/1987643002/ )
>
> Reason for revert:
> Reverting because it is breaking the WebRTC MacTester bot.
>
https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/55969/
>
> Original issue's description:
> > This results in different hashed device IDs on each session on embedders
that don't have a specialized implementation of device ID salts such as WebView,
Blimp and Content Shell. The new default helps prevent user fingerprinting on
these embedders.
> >
> > Since the new default logic is basically the same as for Chrome incognito
mode, Chrome's implementation of salts has been updated to defer to the new
default on incognito mode.
> >
> > BUG=315022
> >
> > Committed: https://crrev.com/4db1329e005388540eb07429ac97827ca9bc422b
> > Cr-Commit-Position: refs/heads/master@{#399883}
>
> TBR=jam@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=315022
>
> Committed: https://crrev.com/f72bda81d0c3e6f256826e9ecdf6d745e4ad76c8
> Cr-Commit-Position: refs/heads/master@{#399887}

TBR=jam@chromium.org
BUG=315022

Committed: https://crrev.com/91768ed181acd514b5d57af73477e69e7a927b6e
Cr-Commit-Position: refs/heads/master@{#399902}
==========

[commit-bot: I haz the power, 2016-06-15 15:51:35]

Patchset 2 (id:??) landed as
https://crrev.com/91768ed181acd514b5d57af73477e69e7a927b6e
Cr-Commit-Position: refs/heads/master@{#399902}