Revert of Remove SVN and File support from gclient

Revert of Remove SVN and File support from gclient (patchset #4 id:60001 of https://codereview.chromium.org/2398493004/ )

Reason for revert:
The Chrome buildbots pass "--transitive" still. Removing the option causes them to fail to build.

Example:

https://uberchromegw.corp.google.com/i/chromeos.chrome/builders/x86-alex-tot-chrome-pfq-informational/builds/21555

Original issue's description:
> Remove SVN and File support from gclient
> 
> FileImpl was only usable with SVN.
> 
> R=maruel@chromium.org
> BUG=641588
> 
> Committed: https://chromium.googlesource.com/chromium/tools/depot_tools/+/b3a24c3fd5159972f58063967a9c07ef724ff97b

TBR=maruel@chromium.org,agable@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=641588
Committed: https://chromium.googlesource.com/chromium/tools/depot_tools/+/398a46ee099e74ee5c8f4550eb6eb48899fbe863

[lpique, 2016-10-11 20:16:25]

The CQ bit was checked by lpique@chromium.org

[lpique, 2016-10-11 20:16:25]

Created Revert of Remove SVN and File support from gclient

[commit-bot: I haz the power, 2016-10-11 20:16:31]

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, 2016-10-11 20:16:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-10-11 20:16:33]

No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or once the patch has
received an L-G-T-M from a full committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
Committers are members of the group "project-infra-committers".
Note that this has nothing to do with OWNERS files.

[agable, 2016-10-11 20:19:49]

The CQ bit was checked by agable@chromium.org

[agable, 2016-10-11 20:19:49]

lgtm

[commit-bot: I haz the power, 2016-10-11 20:19:52]

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, 2016-10-11 20:20:01]

Description was changed from

==========
Revert of Remove SVN and File support from gclient (patchset #4 id:60001 of
https://codereview.chromium.org/2398493004/ )

Reason for revert:
The Chrome buildbots pass "--transitive" still. Removing the option causes them
to fail to build.

Example:

https://uberchromegw.corp.google.com/i/chromeos.chrome/builders/x86-alex-tot-...

Original issue's description:
> Remove SVN and File support from gclient
> 
> FileImpl was only usable with SVN.
> 
> R=maruel@chromium.org
> BUG=641588
> 
> Committed:
https://chromium.googlesource.com/chromium/tools/depot_tools/+/b3a24c3fd51599...

TBR=maruel@chromium.org,agable@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=641588
==========

to

==========
Revert of Remove SVN and File support from gclient (patchset #4 id:60001 of
https://codereview.chromium.org/2398493004/ )

Reason for revert:
The Chrome buildbots pass "--transitive" still. Removing the option causes them
to fail to build.

Example:

https://uberchromegw.corp.google.com/i/chromeos.chrome/builders/x86-alex-tot-...

Original issue's description:
> Remove SVN and File support from gclient
> 
> FileImpl was only usable with SVN.
> 
> R=maruel@chromium.org
> BUG=641588
> 
> Committed:
https://chromium.googlesource.com/chromium/tools/depot_tools/+/b3a24c3fd51599...

TBR=maruel@chromium.org,agable@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=641588

Committed:
https://chromium.googlesource.com/chromium/tools/depot_tools/+/398a46ee099e74...
==========

[commit-bot: I haz the power, 2016-10-11 20:20:02]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/tools/depot_tools/+/398a46ee099e74...