[Mac] Inform reference counted objects that hold a weak Browser* when the Browser is being destroye…

chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm

Index: chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
diff --git a/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm b/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
index 14b691b3e49bdb67be302238d566ccad4124586b..11b1886355fa9d2e3d8a561a8ebea01ec0cb954f 100644
--- a/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
+++ b/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
@@ -87,6 +87,10 @@ const float kRightEdgeOffset = 25;
   return self;
 }
 
+- (void)browserWillBeDestroyed {

[tapted, 2015/07/06 07:26:18]

after dealloc

[jackhou1, 2015/07/07 03:27:27]

Done.

+  browser_ = nullptr;
+}
+
 - (void)dealloc {
   // All animations should have been explicitly stopped before a tab is closed.
   DCHECK(!showHideAnimation_.get());