PlzNavigate: Move navigation-level mixed content checks to the browser.

third_party/WebKit/Source/core/loader/MixedContentChecker.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
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 }
 
 // static
 bool MixedContentChecker::shouldBlockFetch(
     LocalFrame* frame,
     WebURLRequest::RequestContext requestContext,
     WebURLRequest::FrameType frameType,
     ResourceRequest::RedirectStatus redirectStatus,
     const KURL& url,
     MixedContentChecker::ReportingStatus reportingStatus) {
+  // Frame-level loads are checked by the browser. No need to check them again
+  // here.
+  if (frame->settings()->browserSideNavigationEnabled() &&
+      frameType != WebURLRequest::FrameTypeNone) {
+    return false;
+  }
+
   Frame* effectiveFrame = effectiveFrameForFrameType(frame, frameType);
   Frame* mixedFrame =
       inWhichFrameIsContentMixed(effectiveFrame, frameType, url);
   if (!mixedFrame)
     return false;
 
   MixedContentChecker::count(mixedFrame, requestContext);
   if (ContentSecurityPolicy* policy =
           frame->securityContext()->contentSecurityPolicy())
     policy->reportMixedContent(url, redirectStatus);
@@ skipping 276 matching lines @@
   }
 
   bool strictMixedContentCheckingForPlugin =
       mixedFrame->settings() &&
       mixedFrame->settings()->strictMixedContentCheckingForPlugin();
   return WebMixedContent::contextTypeFromRequestContext(
       request.requestContext(), strictMixedContentCheckingForPlugin);
 }
 
 }  // namespace blink