[Mac] Move ScopedSendingEvent from content/common/mac to base/mac.

base/test/mock_chrome_application_mac.h

Index: base/test/mock_chrome_application_mac.h
diff --git a/base/test/mock_chrome_application_mac.h b/base/test/mock_chrome_application_mac.h
index e7e2c678fa4f0aad6583e55d362e92047bbe428e..3ab40a0ecb186dbe2ac309d3b63eaedc5a632b85 100644
--- a/base/test/mock_chrome_application_mac.h
+++ b/base/test/mock_chrome_application_mac.h
@@ -10,12 +10,18 @@
 
 #import <AppKit/AppKit.h>
 
+#include "base/mac/scoped_sending_event.h"
 #include "base/message_pump_mac.h"
 
-// A mock implementation of CrAppProtocol that claims that -sendEvent: is never
-// on the stack. This can be used in tests that need an NSApplication and use a
-// runloop, but don't run nested message loops.
-@interface MockCrApp : NSApplication<CrAppProtocol>
+// A basic implementation of CrAppProtocol and
+// CrAppControlProtocol. This can be used in tests that need an
+// NSApplication and use a runloop, or which need a ScopedSendingEvent
+// when handling a nested event loop.
+@interface MockCrApp : NSApplication<CrAppProtocol,
+                                     CrAppControlProtocol> {
+ @private
+  BOOL handlingSendEvent_;
+}
 @end
 
 #endif