Rename TabContents::controller() to GetController and put it into the WebContents interface.

chrome/browser/instant/instant_controller.cc

Index: chrome/browser/instant/instant_controller.cc
===================================================================
--- chrome/browser/instant/instant_controller.cc	(revision 115228)
+++ chrome/browser/instant/instant_controller.cc	(working copy)
@@ -269,8 +269,8 @@
     InstantCommitType type) {
   DCHECK(loader_.get());
   TabContentsWrapper* tab = ReleasePreviewContents(type);
-  tab->tab_contents()->controller().CopyStateFromAndPrune(
-      &tab_contents_->tab_contents()->controller());
+  tab->tab_contents()->GetController().CopyStateFromAndPrune(
+      &tab_contents_->tab_contents()->GetController());
   delegate_->CommitInstant(tab);
   CompleteRelease(tab);
   return tab;