Revert of Public Sessions - prompt the user for pageCapture requests

Revert of Public Sessions - prompt the user for pageCapture requests (patchset #34 id:720001 of https://codereview.chromium.org/2552203007/ )

Reason for revert:
This CL is causing many PublicSessionPermissionHelperTest unit tests to fail on Linux Chromium OS ASan LSan Tests:

https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/builds/19549

Please fix the leaks before relanding it again.

Original issue's description:
> Public Sessions - prompt the user for pageCapture requests
> 
> In Public Sessions, extensions (and apps) are force-installed by admin policy so the user does not get a chance to review the permissions for these extensions. This is not acceptable from a security/privacy standpoint, so when an extension uses the pageCapture API for the first time, we show the user a dialog where they can choose whether to allow the extension access to the API.
> 
> BUG=689478
> BROWSERTEST=ExtensionPageCaptureApiTest.PublicSessionRequest*
> UNITTEST=PublicSessionPermissionHelperTest.*
> 
> Review-Url: https://codereview.chromium.org/2552203007
> Cr-Commit-Position: refs/heads/master@{#450383}
> Committed: https://chromium.googlesource.com/chromium/src/+/309c0997afe19ab971686abf5cca1dd7fd4f7d8b

TBR=atwilson@chromium.org,rdevlin.cronin@chromium.org,isandrk@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=689478
Review-Url: https://codereview.chromium.org/2697833004
Cr-Commit-Position: refs/heads/master@{#450483}
Committed: https://chromium.googlesource.com/chromium/src/+/618b40d65c8372e95c3fb7bf848560b2a9b14a34

[xlai (Olivia), 2017-02-14 21:52:35]

The CQ bit was checked by xlai@chromium.org

[xlai (Olivia), 2017-02-14 21:52:36]

Created Revert of Public Sessions - prompt the user for pageCapture requests

[commit-bot: I haz the power, 2017-02-14 21:53:28]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-14 21:54:48]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487109155852760, "parent_rev":
"f4729b0eccefc8bd9f46d4e36144b9a53cd02e33", "commit_rev":
"618b40d65c8372e95c3fb7bf848560b2a9b14a34"}

[commit-bot: I haz the power, 2017-02-14 21:55:33]

Description was changed from

==========
Revert of Public Sessions - prompt the user for pageCapture requests (patchset
#34 id:720001 of https://codereview.chromium.org/2552203007/ )

Reason for revert:
This CL is causing many PublicSessionPermissionHelperTest unit tests to fail on
Linux Chromium OS ASan LSan Tests:

https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%2...

Please fix the leaks before relanding it again.

Original issue's description:
> Public Sessions - prompt the user for pageCapture requests
> 
> In Public Sessions, extensions (and apps) are force-installed by admin policy
so the user does not get a chance to review the permissions for these
extensions. This is not acceptable from a security/privacy standpoint, so when
an extension uses the pageCapture API for the first time, we show the user a
dialog where they can choose whether to allow the extension access to the API.
> 
> BUG=689478
> BROWSERTEST=ExtensionPageCaptureApiTest.PublicSessionRequest*
> UNITTEST=PublicSessionPermissionHelperTest.*
> 
> Review-Url: https://codereview.chromium.org/2552203007
> Cr-Commit-Position: refs/heads/master@{#450383}
> Committed:
https://chromium.googlesource.com/chromium/src/+/309c0997afe19ab971686abf5cca...

TBR=atwilson@chromium.org,rdevlin.cronin@chromium.org,isandrk@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=689478
==========

to

==========
Revert of Public Sessions - prompt the user for pageCapture requests (patchset
#34 id:720001 of https://codereview.chromium.org/2552203007/ )

Reason for revert:
This CL is causing many PublicSessionPermissionHelperTest unit tests to fail on
Linux Chromium OS ASan LSan Tests:

https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%2...

Please fix the leaks before relanding it again.

Original issue's description:
> Public Sessions - prompt the user for pageCapture requests
> 
> In Public Sessions, extensions (and apps) are force-installed by admin policy
so the user does not get a chance to review the permissions for these
extensions. This is not acceptable from a security/privacy standpoint, so when
an extension uses the pageCapture API for the first time, we show the user a
dialog where they can choose whether to allow the extension access to the API.
> 
> BUG=689478
> BROWSERTEST=ExtensionPageCaptureApiTest.PublicSessionRequest*
> UNITTEST=PublicSessionPermissionHelperTest.*
> 
> Review-Url: https://codereview.chromium.org/2552203007
> Cr-Commit-Position: refs/heads/master@{#450383}
> Committed:
https://chromium.googlesource.com/chromium/src/+/309c0997afe19ab971686abf5cca...

TBR=atwilson@chromium.org,rdevlin.cronin@chromium.org,isandrk@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=689478

Review-Url: https://codereview.chromium.org/2697833004
Cr-Commit-Position: refs/heads/master@{#450483}
Committed:
https://chromium.googlesource.com/chromium/src/+/618b40d65c8372e95c3fb7bf8485...
==========

[commit-bot: I haz the power, 2017-02-14 21:55:34]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/618b40d65c8372e95c3fb7bf8485...