Fix dragging supported files to tab strip.

chrome/browser/ui/views/tabs/browser_tab_strip_controller.h

Index: chrome/browser/ui/views/tabs/browser_tab_strip_controller.h
diff --git a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.h b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.h
index 06da49234cdb66d8467283a8be30db539e5033ad..35e8940b612d84b2cc20916d65fed4398d22889d 100644
--- a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.h
+++ b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.h
@@ -74,6 +74,7 @@ class BrowserTabStripController : public TabStripController,
   virtual void LayoutTypeMaybeChanged() OVERRIDE;
   virtual void OnStartedDraggingTabs() OVERRIDE;
   virtual void OnStoppedDraggingTabs() OVERRIDE;
+  virtual void CheckFileSupported(const GURL& url) OVERRIDE;
 
   // TabStripModelObserver implementation:
   virtual void TabInsertedAt(content::WebContents* contents,
@@ -139,6 +140,11 @@ class BrowserTabStripController : public TabStripController,
   // Resets the tabstrips layout type from prefs.
   void UpdateLayoutType();
 
+  // Notifies the tabstrip whether |url| is supported once a MIME type request
+  // has completed.
+  void OnFindURLMimeTypeCompleted(const GURL& url,
+                                  const std::string& mime_type);
+
   TabStripModel* model_;
 
   TabStrip* tabstrip_;
@@ -159,6 +165,8 @@ class BrowserTabStripController : public TabStripController,
 
   PrefChangeRegistrar local_pref_registrar_;
 
+  base::WeakPtrFactory<BrowserTabStripController> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserTabStripController);
 };