Remove ChromeV8Extension & most of ChromeV8Context
This replaces all ChromeV8Extension usage with ObjectBackedNativeHandler
and in the process changes most ChromeV8Context references into
ScriptContext references.
Also, since it would be ugly and confusing otherwise,
ChromeV8ContextSet is now ScriptContextSet and is moved
to //extensions/renderer.
BUG=359836
TBR=sky@chromium.org for //c/test and ChromeContentRendererCilent
TBR=bbudge@chromium.org for //c/r/pepper
Review URL: https://codereview.chromium.org/
240603003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@264605 0039d316-1c4b-4281-b951-d872f2087c98