Mac: Fix SDK 10.11 Compile errors after clang roll in r387792

chrome/browser/ui/cocoa/base_bubble_controller.h

Index: chrome/browser/ui/cocoa/base_bubble_controller.h
diff --git a/chrome/browser/ui/cocoa/base_bubble_controller.h b/chrome/browser/ui/cocoa/base_bubble_controller.h
index 7de195c70708166fb9793094d1071bdbd6125a26..1314263b15a635bcb0d33ea28f364c90e7ee015e 100644
--- a/chrome/browser/ui/cocoa/base_bubble_controller.h
+++ b/chrome/browser/ui/cocoa/base_bubble_controller.h
@@ -88,6 +88,9 @@ class TabStripModelObserverBridge;
         parentWindow:(NSWindow*)parentWindow
           anchoredAt:(NSPoint)anchoredAt;
 
+// Closes the bubble with BUBBLE_CLOSE_CANCELED.
+- (IBAction)cancel:(id)sender;
+
 // Creates an autoreleased horizontal separator view with a given frame. The
 // height of the frame is ignored.
 - (NSBox*)horizontalSeparatorWithFrame:(NSRect)frame;