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- check inner URL for nested URLs;
- check actual RFH of RenderFrameDevToolsAgentHost;

Bug: 1125362
Change-Id: I6d593d45d749b2a34d7711a983e2bda730027117
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506354Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823249}