[Manifest] Update a RenderFrame's Manifest when navigated.

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/render_frame.h"
@@ skipping 83 matching lines @@
     return;
 
   FetchManifest();
 }
 
 void ManifestManager::DidChangeManifest() {
   may_have_manifest_ = true;
   manifest_dirty_ = true;
 }
 
+void ManifestManager::DidCommitProvisionalLoad(bool is_new_navigation) {
+  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);
     return;
   }
 
   fetcher_.reset(new ManifestFetcher(url));
@@ skipping 49 matching lines @@
 
   pending_callbacks_.clear();
 
   for (std::list<GetManifestCallback>::const_iterator it = callbacks.begin();
        it != callbacks.end(); ++it) {
     it->Run(manifest);
   }
 }
 
 } // namespace content