Clean up TCW, make it solely a hub for 1:1 observer/helper objects.

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index 6634fd819fecab8b33ce4049ba129ddcf67a26d8..d6ef959b6a148531972939a71d41169006fb37b1 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -1353,9 +1353,12 @@ IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderRendererCrash) {
   // Navigate to about:crash and then wait for the renderer to crash.
   ASSERT_TRUE(GetPrerenderContents());
   ASSERT_TRUE(GetPrerenderContents()->prerender_contents());
-  GetPrerenderContents()->prerender_contents()->controller().LoadURL(
-      GURL(chrome::kAboutCrashURL), content::Referrer(),
-      content::PAGE_TRANSITION_TYPED, std::string());
+  GetPrerenderContents()->prerender_contents()->tab_contents()->controller().
+      LoadURL(
+          GURL(chrome::kAboutCrashURL),
+          content::Referrer(),
+          content::PAGE_TRANSITION_TYPED,
+          std::string());
   ui_test_utils::RunMessageLoop();
 }