[Android] Adjust XWalkPermissionClient::allowImage's signature.

The parent method's signature changed in Chromium r170983.

(cherry picked from commit 2f8d5233279a9dbafb5c77956422d9e29d3166bc)
[Android] Adjust XWalkRenderViewExt::DidCommitProvisionalLoad's signature.

The parent method's signature changed in r261764.

(cherry picked from commit 20f82b544c3430012aebf4238f0d5f89b6a784d0)
[Android] Adjust RuntimeResourceDispatcherHostDelegateAndroid::HandleExternalProtocol's signature.

The parent method's signature changed in r261014.

(cherry picked from commit e8635c8c5d83f0d07584957269002a6aefe7395c)
[Android] Rename XWalkRenderViewHostExt::RenderViewGone.

The method was renamed to RenderProcessGone upstream in r210727 more
than a year ago.

(cherry picked from commit 82240377e4571a456b85f2daf62085832a2c4ad2)
Merge pull request #2305 from darktears/crosswalk-8

Crosswalk 8