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

chrome/browser/ui/cocoa/html_dialog_window_controller.mm

Index: chrome/browser/ui/cocoa/html_dialog_window_controller.mm
===================================================================
--- chrome/browser/ui/cocoa/html_dialog_window_controller.mm	(revision 115228)
+++ chrome/browser/ui/cocoa/html_dialog_window_controller.mm	(working copy)
@@ -298,11 +298,11 @@
   HtmlDialogUI::GetPropertyAccessor().SetProperty(
       contentsWrapper_->tab_contents()->GetPropertyBag(), delegate_.get());
 
-  contentsWrapper_->tab_contents()->controller().LoadURL(
-                                      delegate_->GetDialogContentURL(),
-                                      content::Referrer(),
-                                      content::PAGE_TRANSITION_START_PAGE,
-                                      std::string());
+  contentsWrapper_->tab_contents()->GetController().LoadURL(
+      delegate_->GetDialogContentURL(),
+      content::Referrer(),
+      content::PAGE_TRANSITION_START_PAGE,
+      std::string());
 
   // TODO(akalin): add accelerator for ESC to close the dialog box.
   //