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The ExtensionFrameHelper already has logic to find extension frames
matching certain criteria, which is used by custom bindings to return
the global objects for those frames. Move the logic to get the v8
global objects from the custom bindings to the ExtensionFrameHelper in
order to allow re-use with other bindings.

Bug: 653596

Change-Id: Ibb7d57e90bdb83cd574a95eb80db222456dd3e79
Reviewed-on: https://chromium-review.googlesource.com/763572
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517151}