Move instant support to SearchTabHelper.

chrome/browser/ui/search/instant_controller.h

Index: chrome/browser/ui/search/instant_controller.h
diff --git a/chrome/browser/ui/search/instant_controller.h b/chrome/browser/ui/search/instant_controller.h
index cdb170bc55056603a11d19153bc4153811765d35..f41d1b45dd19d4f75165d7824a4481b7645d20a8 100644
--- a/chrome/browser/ui/search/instant_controller.h
+++ b/chrome/browser/ui/search/instant_controller.h
@@ -243,6 +243,11 @@ class InstantController : public InstantPage::Delegate {
   // happen through the InstantController interface.
   InstantOverlayModel* model() { return &model_; }
 
+  // Used by BrowserInstantController to notify InstantController about the
+  // instant support change event for the given |web_contents|.
+  void InstantSupportChanged(const content::WebContents* web_contents,
+                             InstantSupportState instant_support);
+
  protected:
   // Accessors are made protected for testing purposes.
   virtual bool extended_enabled() const;