Don't try to rebaseline tests that pass on all the bots.

_rebaseline throws an error if you pass it an empty test list.

Review URL: https://chromiumcodereview.appspot.com/20873003

git-svn-id: svn://svn.chromium.org/blink/trunk@155057 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Drop CachedScript from ScriptExecutionContext.

The CachedScript* parameters to the various 'onerror' handler methods on
ScriptExecutionContext are an artifact of the JSC implementation in
WebKit. Blink will implement the sanitization functionality differently,
which means we can safely remove the CachedScript references to clean
things up a bit.

BUG=159566

Review URL: https://chromiumcodereview.appspot.com/20883003

git-svn-id: svn://svn.chromium.org/blink/trunk@155058 bbb929c8-8fbe-4397-9dbb-9b2b20218538