PlzNavigate: ensure POST navigations are treated as different document

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
@@ skipping 1496 matching lines @@
   checkCompleted();
 }
 
 bool FrameLoader::shouldPerformFragmentNavigation(bool isFormSubmission,
                                                   const String& httpMethod,
                                                   FrameLoadType loadType,
                                                   const KURL& url) {
   // We don't do this if we are submitting a form with method other than "GET",
   // explicitly reloading, currently displaying a frameset, or if the URL does
   // not have a fragment.
-  return (!isFormSubmission || equalIgnoringCase(httpMethod, HTTPNames::GET)) &&
+  return equalIgnoringCase(httpMethod, HTTPNames::GET) &&
          !isReloadLoadType(loadType) && loadType != FrameLoadTypeBackForward &&
          url.hasFragmentIdentifier() &&
          equalIgnoringFragmentIdentifier(m_frame->document()->url(), url)
          // We don't want to just scroll if a link from within a frameset is
          // trying to reload the frameset into _top.
          && !m_frame->document()->isFrameSet();
 }
 
 void FrameLoader::processFragment(const KURL& url,
                                   LoadStartType loadStartType) {
@@ skipping 399 matching lines @@
                          m_documentLoader ? m_documentLoader->url() : String());
   return tracedValue;
 }
 
 inline void FrameLoader::takeObjectSnapshot() const {
   TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID("loading", "FrameLoader", this,
                                       toTracedValue());
 }
 
 }  // namespace blink