[sql] Remove Favicons v5 and v6 recovery code.

Remove recovery code for older schema versions.  After a full release
cycle, the number of previous-version corrupt databases which are
recoverable is expected to be very small.

BUG=327485

Review URL: https://codereview.chromium.org/151883007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249306 0039d316-1c4b-4281-b951-d872f2087c98
cc: Enable rendering stats recording in browser compositor.

This patch moves the kEnableGpuBenchmarking switch from
content switches to cc switches for it to be accessible from
ui/compositor/compositor.cc.

If the flag is set, the browser compositor enalbes recording of rendering
stats in its constructor. The recorded stats will be used by a follow-up patch
that switches smoothness benchmark to use time stamps from the browser
compositor when available.

R=piman@chromium.org,nduca@chromium.org
BUG=340747

Review URL: https://codereview.chromium.org/148983007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249307 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249307