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

BUG=454457

Review URL: https://codereview.chromium.org/896823002

Cr-Commit-Position: refs/heads/master@{#314534}

content/browser/manifest/manifest_browsertest.cc

@@ -281,4 +281,32 @@ IN_PROC_BROWSER_TEST_F(ManifestBrowserTest, ParsingErrorsManifest) {
   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

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());
 

content/renderer/manifest/manifest_manager.h

@@ -42,6 +42,7 @@ class ManifestManager : public RenderFrameObserver {
   // RenderFrameObserver implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
   void DidChangeManifest() override;
+  void DidCommitProvisionalLoad(bool is_new_navigation) override;
 
  private:
   enum ResolveState {