Reland #1 of: Move WebUI ownership from the RenderFrameHostManager to the RenderFrameHost.

content/browser/frame_host/render_frame_host_manager_browsertest.cc

Index: content/browser/frame_host/render_frame_host_manager_browsertest.cc
diff --git a/content/browser/frame_host/render_frame_host_manager_browsertest.cc b/content/browser/frame_host/render_frame_host_manager_browsertest.cc
index d06b2ff90bf93016c2dc38e9987dd57835be31d1..5e7ac6451fb623512dbe5fd56d5d4662c21c47bb 100644
--- a/content/browser/frame_host/render_frame_host_manager_browsertest.cc
+++ b/content/browser/frame_host/render_frame_host_manager_browsertest.cc
@@ -1546,14 +1546,16 @@ IN_PROC_BROWSER_TEST_F(RenderFrameHostManagerTest,
       shell()->web_contents());
   WebUIImpl* webui = web_contents->GetRenderManagerForTesting()->web_ui();
   EXPECT_TRUE(webui);
-  EXPECT_FALSE(web_contents->GetRenderManagerForTesting()->pending_web_ui());
+  EXPECT_FALSE(
+      web_contents->GetRenderManagerForTesting()->GetNavigatingWebUI());
 
   // Navigate to another WebUI URL that reuses the WebUI object.  Make sure we
-  // clear pending_web_ui() when it commits.
+  // clear GetNavigatingWebUI() when it commits.
   GURL webui_url2(webui_url.spec() + "#foo");
   NavigateToURL(shell(), webui_url2);
   EXPECT_EQ(webui, web_contents->GetRenderManagerForTesting()->web_ui());
-  EXPECT_FALSE(web_contents->GetRenderManagerForTesting()->pending_web_ui());
+  EXPECT_FALSE(
+      web_contents->GetRenderManagerForTesting()->GetNavigatingWebUI());
 }
 
 class RFHMProcessPerTabTest : public RenderFrameHostManagerTest {