linux_aura: Fix all instances of LabelButton sizing.

Previous attempts at fixing this involved tracking down each button
which was setting the minimum size to 0,0. Those attempts are reverted,
as I no longer think they're wrong. The actual fix is to pass through
the views inset size instead of using the GTK inset size.

BUG=349183, 344498, 339247
R=msw@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/187133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255091 0039d316-1c4b-4281-b951-d872f2087c98
Update V8 to version 3.25.4 (based on bleeding_edge revision r19679).

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/187863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255092 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255093 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255093
Added a platform policy loader for iOS.

This policy loader get managed app configuration from NSUserDefaults and
applies it as platform policy on iOS.

BUG=348820

Review URL: https://codereview.chromium.org/177813004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255094 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255094