[Mac] ScopedSendingEvent finds NSApp by itself.

chrome/browser/tab_contents/tab_contents_view_mac.mm

Index: chrome/browser/tab_contents/tab_contents_view_mac.mm
diff --git a/chrome/browser/tab_contents/tab_contents_view_mac.mm b/chrome/browser/tab_contents/tab_contents_view_mac.mm
index b817315e6fef59cd1adf7d1135d19f0b76576016..9a06d66b3cae0ec4f8bbc8a7f1f3f6df84dbd120 100644
--- a/chrome/browser/tab_contents/tab_contents_view_mac.mm
+++ b/chrome/browser/tab_contents/tab_contents_view_mac.mm
@@ -134,8 +134,7 @@ void TabContentsViewMac::StartDragging(const WebDropData& drop_data,
   // processing -sendEvent:, so Close() is deferred in that case.
   // Drags from web content do not come via -sendEvent:, this sets the
   // same flag -sendEvent: would.
-  chrome_application_mac::ScopedSendingEvent sendingEventScoper(
-      static_cast<CrApplication*>([CrApplication sharedApplication]));
+  chrome_application_mac::ScopedSendingEvent sendingEventScoper;
 
   // The drag invokes a nested event loop, arrange to continue
   // processing events.