Try to fix linux build after image decoder move.

BUG=
TBR=ojan

Review URL: https://codereview.chromium.org/13860012

git-svn-id: svn://svn.chromium.org/blink/trunk@149042 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Absolutify paths to platform/animation, platform/audio, platform/audio/chromium.

BUG=234793
TBR=abarth

Review URL: https://codereview.chromium.org/14358027

git-svn-id: svn://svn.chromium.org/blink/trunk@149043 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove left-over PageCache stuff

PageCache was removed in r148973. This patch removes the rest
of the Settings code (except a stub which is waiting on a Chromium
patch to take care of it) as well as various comments/logging code.

Finally, it gets rid of LayoutTests that are no longer exercising
anything interesting. In a few cases, the test still seems to be
testing interesting behavior; these have been updated to remove
their reference to the UsesPageCache pref.

R=abarth
BUG=229605

Review URL: https://codereview.chromium.org/14481003

git-svn-id: svn://svn.chromium.org/blink/trunk@149044 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Absolutify paths to platform/chromium, platform/chromium/support,
platform/mediastream, platform/mediastream/chromium, platform/mock.

BUG=234793
TBR=abarth

Review URL: https://codereview.chromium.org/14483003

git-svn-id: svn://svn.chromium.org/blink/trunk@149045 bbb929c8-8fbe-4397-9dbb-9b2b20218538