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

content/renderer/manifest/manifest_manager.cc

Index: content/renderer/manifest/manifest_manager.cc
diff --git a/content/renderer/manifest/manifest_manager.cc b/content/renderer/manifest/manifest_manager.cc
index 5c620c0d13644ae1d64dd331cf00bf3a295cdce1..a5ee94cf6b59c4d7829d5373c93b434b7f677dcc 100644
--- a/content/renderer/manifest/manifest_manager.cc
+++ b/content/renderer/manifest/manifest_manager.cc
@@ -101,6 +101,11 @@ void ManifestManager::DidChangeManifest() {
   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());