Remove very stale code that tries to disable compositing mode in aura

There's no such thing as disabling compositing for tab contents in aura.

BUG=319009
R=jbauman@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/61743020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234984 0039d316-1c4b-4281-b951-d872f2087c98
InstantExtended: update tests for Instant Extended (part 3).

Disable tests that no longer will work with Instant Extended. Most of these are
NTP4 tests that no longer make sense and should be deleted along with the rest
of NTP4 code. There are three actual test failures corresponding to an actual
bug or a bad interaction between the test and Instant Extended (all of these
have bugs filed for them).

(Note that this is split off from http://crrev.com/24733003.)

BUG=297915

Review URL: https://codereview.chromium.org/61003007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234986 0039d316-1c4b-4281-b951-d872f2087c98
Blink roll 161914:161957

http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=161915:161957&mode=html

TBR=kinuko

Review URL: https://codereview.chromium.org/69923009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234987 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234988 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234987
SVN changes up to revision 234988