[Mac] ScopedSendingEvent finds NSApp by itself.

base/chrome_application_mac.mm

Index: base/chrome_application_mac.mm
diff --git a/base/chrome_application_mac.mm b/base/chrome_application_mac.mm
index d2d8f9f6e878a90c74baada05b16152b5601deb8..cdad4ab81ebd38bb7eb48281a16c76d5b684f8d8 100644
--- a/base/chrome_application_mac.mm
+++ b/base/chrome_application_mac.mm
@@ -29,7 +29,7 @@
 }
 
 - (void)sendEvent:(NSEvent*)event {
-  chrome_application_mac::ScopedSendingEvent sendingEventScoper(self);
+  chrome_application_mac::ScopedSendingEvent sendingEventScoper;
   [super sendEvent:event];
 }
 
@@ -37,8 +37,9 @@
 
 namespace chrome_application_mac {
 
-ScopedSendingEvent::ScopedSendingEvent(CrApplication* app) : app_(app) {
-  handling_ = [app_ isHandlingSendEvent];
+ScopedSendingEvent::ScopedSendingEvent()
+    : app_(static_cast<CrApplication*>([CrApplication sharedApplication])),
+      handling_([app_ isHandlingSendEvent]) {
   [app_ setHandlingSendEvent:YES];
 }