Add ScopedObjCClassSwizzler in base/mac, absorbs objc_method_swizzle and ScopedClassSwizzler

ui/events/cocoa/events_mac_unittest.mm

Index: ui/events/cocoa/events_mac_unittest.mm
diff --git a/ui/events/cocoa/events_mac_unittest.mm b/ui/events/cocoa/events_mac_unittest.mm
index 77f85495f481a8b32842a5acb0d13d4a94e4eeab..701739da41a950072f8fed9b5cee147d5c8eb338 100644
--- a/ui/events/cocoa/events_mac_unittest.mm
+++ b/ui/events/cocoa/events_mac_unittest.mm
@@ -8,6 +8,7 @@
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
+#import "base/test/scoped_class_swizzler_mac.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/events/event_constants.h"
 #import "ui/events/test/cocoa_test_event_utils.h"
@@ -57,7 +58,7 @@ class EventsMacTest : public CocoaTest {
 
   void SwizzleMiddleMouseButton() {
     DCHECK(!swizzler_);
-    swizzler_.reset(new ScopedClassSwizzler(
+    swizzler_.reset(new base::ScopedClassSwizzler(
         [NSEvent class],
         [MiddleMouseButtonNumberDonor class],
         @selector(buttonNumber)));
@@ -67,7 +68,7 @@ class EventsMacTest : public CocoaTest {
     DCHECK(!g_test_window);
     DCHECK(!swizzler_);
     g_test_window = test_window();
-    swizzler_.reset(new ScopedClassSwizzler(
+    swizzler_.reset(new base::ScopedClassSwizzler(
         [NSEvent class],
         [TestWindowDonor class],
         @selector(window)));
@@ -117,7 +118,7 @@ class EventsMacTest : public CocoaTest {
   }
 
  private:
-  scoped_ptr<ScopedClassSwizzler> swizzler_;
+  scoped_ptr<base::ScopedClassSwizzler> swizzler_;
 
   DISALLOW_COPY_AND_ASSIGN(EventsMacTest);
 };