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For conceptual and performance reasons, the v8 API will require explicit passing
of Isolates in the future instead of relying on the retrieval of one out of thin
air (= either TLS or an evil global variable in v8). This CL makes the Isolate
explicit in ProxyResolverV8::Context.

The default Isolate is retrieved and remembered in the main browser thread and
then passed down to the Context where it is needed in different threads.

Review URL: https://codereview.chromium.org/11959029
Patch from Sven Panne <svenpanne@chromium.org>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180134 0039d316-1c4b-4281-b951-d872f2087c98