Consolidate SDK forwards in sdk_forward_declarations.h.

content/browser/renderer_host/render_widget_host_view_mac_unittest.mm

Index: content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm b/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
index 975e625a103d6e8bd6b8f88f9ef93a11a7836681..da766eac4adf825b2b51000371a4031fa85c6e58 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
@@ -6,6 +6,7 @@
 
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
+#include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
@@ -23,25 +24,6 @@
 #include "ui/events/test/cocoa_test_event_utils.h"
 #import "ui/gfx/test/ui_cocoa_test_helper.h"
 
-// Declare things that are part of the 10.7 SDK.
-#if !defined(MAC_OS_X_VERSION_10_7) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-enum {
-  NSEventPhaseNone        = 0, // event not associated with a phase.
-  NSEventPhaseBegan       = 0x1 << 0,
-  NSEventPhaseStationary  = 0x1 << 1,
-  NSEventPhaseChanged     = 0x1 << 2,
-  NSEventPhaseEnded       = 0x1 << 3,
-  NSEventPhaseCancelled   = 0x1 << 4,
-};
-typedef NSUInteger NSEventPhase;
-
-@interface NSEvent (LionAPI)
-- (NSEventPhase)phase;
-@end
-
-#endif  // 10.7
-
 // Helper class with methods used to mock -[NSEvent phase], used by
 // |MockScrollWheelEventWithPhase()|.
 @interface MockPhaseMethods : NSObject {