Remove SVN support from gclient_utils and gclient_scm

Remove SVN support from gclient_utils and gclient_scm

This removes SVN support (most notably the SVNWrapper class, and the git-svn
logic in GitWrapper.GetUsableRev) from gclient_scm. It also removes some
references to SVN from comments in gclient_utils.

R=maruel@chromium.org
BUG=641588
Committed: https://chromium.googlesource.com/chromium/tools/depot_tools/+/41e3a6c5530893d6c6046fa620fe5f335a4ef418

[agable, 2016-10-05 21:07:16]

This is the second small piece. I'm sending many of the other
(non-gclient-specific) pieces to other reviewers.

[M-A Ruel, 2016-10-05 21:14:57]

lgtm but let's https://codereview.chromium.org/2398493004/ bake for a few days
before committing this CL.

[agable, 2016-10-20 18:32:11]

Previous CL has baked for ~3 days. One piece of small fallout which was quickly
fixed. Landing this.

[agable, 2016-10-20 18:33:34]

The CQ bit was checked by agable@chromium.org

[agable, 2016-10-20 18:33:35]

The patchset sent to the CQ was uploaded after l-g-t-m from maruel@chromium.org
Link to the patchset: https://codereview.chromium.org/2393773003/#ps80001
(title: "Rebase")

[commit-bot: I haz the power, 2016-10-20 18:33:41]

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, 2016-10-20 18:36:58]

Description was changed from

==========
Remove SVN support from gclient_utils and gclient_scm

This removes SVN support (most notably the SVNWrapper class, and the git-svn
logic in GitWrapper.GetUsableRev) from gclient_scm. It also removes some
references to SVN from comments in gclient_utils.

R=maruel@chromium.org
BUG=641588
==========

to

==========
Remove SVN support from gclient_utils and gclient_scm

This removes SVN support (most notably the SVNWrapper class, and the git-svn
logic in GitWrapper.GetUsableRev) from gclient_scm. It also removes some
references to SVN from comments in gclient_utils.

R=maruel@chromium.org
BUG=641588

Committed:
https://chromium.googlesource.com/chromium/tools/depot_tools/+/41e3a6c5530893...
==========

[commit-bot: I haz the power, 2016-10-20 18:36:59]

Committed patchset #5 (id:80001) as
https://chromium.googlesource.com/chromium/tools/depot_tools/+/41e3a6c5530893...