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This CL removes the GetInitiatorSchemeBypassingDocumentBlocking method
from ContentBrowserClient.

This method used to be called by implementation of Cross-Origin Read
Blocking (CORB) before NetworkService shipped.  This dependency is gone
now.

Before this CL, the only remaining caller of this method was
AppCacheSubresourceURLFactory::CreateLoaderAndStart.  The method was
called to exclude content script requests from request_initiator checks
(this exclusion was introduced in r624685).  Such exclusion is no longer
needed, after request_initiator=website (see r694827 and r710554).

Bug: 940068
Change-Id: I736f1414ffe890da9cd6477d377f4482168befae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1926541Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724030}