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

content/browser/manifest/manifest_browsertest.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 "base/command_line.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/manifest.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
@@ skipping 263 matching lines @@
 
   TestNavigationObserver navigation_observer(shell()->web_contents(), 1);
   shell()->LoadURL(test_url);
   navigation_observer.Wait();
 
   GetManifestAndWait();
   EXPECT_TRUE(manifest().IsEmpty());
   EXPECT_EQ(6u, console_error_count());
 }
 
+// If a page has a manifest and the page is navigated to a page without a
+// manifest, the page's manifest should be updated.
+IN_PROC_BROWSER_TEST_F(ManifestBrowserTest, Navigation) {
+  {
+    GURL test_url = GetTestUrl("manifest", "dummy-manifest.html");
+
+    TestNavigationObserver navigation_observer(shell()->web_contents(), 1);
+    shell()->LoadURL(test_url);
+    navigation_observer.Wait();
+
+    GetManifestAndWait();
+    EXPECT_FALSE(manifest().IsEmpty());
+    EXPECT_EQ(0u, console_error_count());
+  }
+
+  {
+    GURL test_url = GetTestUrl("manifest", "no-manifest.html");
+
+    TestNavigationObserver navigation_observer(shell()->web_contents(), 1);
+    shell()->LoadURL(test_url);
+    navigation_observer.Wait();
+
+    GetManifestAndWait();
+    EXPECT_TRUE(manifest().IsEmpty());
+    EXPECT_EQ(0u, console_error_count());
+  }
+}
+
 } // namespace content