Remove DELETE permission on the sandboxed desktop

It's not needed, and it may allow a narrow window where the desktop
can be deleted and replaced by one with looser permissions.

BUG=346586
R=cpu

Review URL: https://codereview.chromium.org/189993005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256261 0039d316-1c4b-4281-b951-d872f2087c98
QUIC - rename |read_start_time_| to |disk_cache_load_start_time_|.

R=wtc@chromium.org

Review URL: https://codereview.chromium.org/192583005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256262 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256262
Implement native mirror tutorial on mac

For spec and mock please refer to the attached bug

BUG=324051

Review URL: https://codereview.chromium.org/189603011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256263 0039d316-1c4b-4281-b951-d872f2087c98
Revert of Update V8 to version 3.25.7 (based on bleeding_edge revision r19776). (https://codereview.chromium.org/194273006/)

Reason for revert:
browser_test failures on ChromiumOS

Original issue's description:
> Update V8 to version 3.25.7 (based on bleeding_edge revision r19776).
> 
> R=dslomov@chromium.org
> TBR=dslomov@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=256223

TBR=dslomov@chromium.org,machenbach@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/195323003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256264 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256263
Disable sync tests failing on linux_chromium_chromeos_rel:

- TwoClientPreferencesSyncTest.kTapToClickEnabled
- SyncErrorTest.ErrorWhileSettingUp

See https://groups.google.com/a/chromium.org/d/msg/chromium-dev/6qX-Sq_x1c4/mhlPgmelAeYJ

TBR=lipalani,rsimha

BUG=351159,351160

Review URL: https://codereview.chromium.org/193983002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256265 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256266 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256266