Revert 152927 "Do not clamp image to source rectangle for HTMLCa..."

Caused spaceport benchmark to crash.

BUG=253564

> Do not clamp image to source rectangle for HTMLCanvasElement.
> 
> Added a flag to GraphicsContext to determine whether clamping should be used.
> It is on by default and flagged off in HTMLCanvasElement.
> 
> BUG=165711
> 
> Review URL: https://chromiumcodereview.appspot.com/17385016

TBR=arbesfeld@chromium.org

Review URL: https://codereview.chromium.org/17625005

git-svn-id: svn://svn.chromium.org/blink/trunk@152968 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Tweak time values on webkitpy ExecutiveTest.serial_run_test_in_parallel

This test can be flaky on lower-end machines. If this doesn't help, I
may have to give up on this test altogether.

TBR=ojan@chromium.org
BUG=

Review URL: https://codereview.chromium.org/17567006

git-svn-id: svn://svn.chromium.org/blink/trunk@152969 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-aborted.html slow.

TBR=
BUG=

Review URL: https://codereview.chromium.org/17609003

git-svn-id: svn://svn.chromium.org/blink/trunk@152970 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove --tolerance from run-webkit-tests.

This was never actually implemented/supported for the Chromium ports.

This patch deletes a lot of code used to support the non-chromium
implementations of imagediff, which did diffs over a persistent sockets.

It also removes the 'image_diff_percent' field from the results.json files, and updates the dashbards to no longer look for that field. 

This patch also amends test-webkitpy to actually run the unit tests for TestResultsServer, and stops trying to run the tests for QueueStatusServer, since that's long gone.

R=ojan@chromium.org, abarth@chromium.org
BUG=245504

Review URL: https://chromiumcodereview.appspot.com/17183011

git-svn-id: svn://svn.chromium.org/blink/trunk@152971 bbb929c8-8fbe-4397-9dbb-9b2b20218538
MediaStream API: Final patch of removing MediaStreamSourcesQuery
All old code in chromium have now been removed so cleaning away the
rest of the unused code.

BUG=

Review URL: https://chromiumcodereview.appspot.com/17590004

git-svn-id: svn://svn.chromium.org/blink/trunk@152972 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Clean up remaining DumpRenderTree references and flags.

content_shell/Content Shell everywhere now :).

R=jochen@chromium.org
BUG=252558

Review URL: https://chromiumcodereview.appspot.com/17564007

git-svn-id: svn://svn.chromium.org/blink/trunk@152973 bbb929c8-8fbe-4397-9dbb-9b2b20218538