Do not reset ManifestManager state for same page navigation.

content/renderer/manifest/manifest_manager.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/manifest/manifest_manager.h"
 
 #include "base/bind.h"
 #include "base/strings/nullable_string16.h"
 #include "content/common/manifest_manager_messages.h"
+#include "content/public/renderer/document_state.h"
+#include "content/public/renderer/navigation_state.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/renderer/fetchers/manifest_fetcher.h"
 #include "content/renderer/manifest/manifest_parser.h"
 #include "content/renderer/manifest/manifest_uma_util.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 
 namespace content {
@@ skipping 75 matching lines @@
 
   FetchManifest();
 }
 
 void ManifestManager::DidChangeManifest() {
   may_have_manifest_ = true;
   manifest_dirty_ = true;
 }
 
 void ManifestManager::DidCommitProvisionalLoad(bool is_new_navigation) {
+  NavigationState* navigation_state = DocumentState::FromDataSource(
+        render_frame()->GetWebFrame()->dataSource())->navigation_state();
+  if (navigation_state->was_within_same_page())
+    return;
+
   may_have_manifest_ = false;
   manifest_dirty_ = true;
 }
 
 void ManifestManager::FetchManifest() {
   GURL url(render_frame()->GetWebFrame()->document().manifestURL());
 
   if (url.is_empty()) {
     ManifestUmaUtil::FetchFailed(ManifestUmaUtil::FETCH_EMPTY_URL);
     ResolveCallbacks(ResolveStateFailure);
@@ skipping 53 matching lines @@
 
   pending_callbacks_.clear();
 
   for (std::list<GetManifestCallback>::const_iterator it = callbacks.begin();
        it != callbacks.end(); ++it) {
     it->Run(manifest);
   }
 }
 
 } // namespace content