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OpenURLInterceptor introduced by crrev.com/c/2259537 couldn't
intercept OpenURL method because OpenURLInterceptor should intercept
the message of RenderFrameProxyHost interface instead of FrameHost
interface. This CL makes OpenURLInterceptor intercept OpenURL method
via RenderFrameProxyHost interface.

TEST: SecurityExploitBrowserTest.InvalidRemoteNavigationInitiator
Bug: 1093920
Change-Id: I64b7039e07186f9728e0d69ee6c4ba5298d98600
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387548Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#803850}