[mac] Implement a windowed extension install/permissions prompt.

chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm

Index: chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm b/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm
index e24351a29d2272490f3e7762c5807f22eb2cccb6..f70ba57d84acf07dd5d0c5c8d3daf03df7119d39 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.mm
@@ -6,31 +6,12 @@
 
 #import "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
+#import "base/mac/sdk_forward_declarations.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller_target.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_view.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_window_controller.h"
 
-// Replicate specific 10.7 SDK declarations for building with prior SDKs.
-#if !defined(MAC_OS_X_VERSION_10_7) || \
-MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-
-enum {
-  NSWindowAnimationBehaviorDefault = 0,
-  NSWindowAnimationBehaviorNone = 2,
-  NSWindowAnimationBehaviorDocumentWindow = 3,
-  NSWindowAnimationBehaviorUtilityWindow = 4,
-  NSWindowAnimationBehaviorAlertPanel = 5
-};
-typedef NSInteger NSWindowAnimationBehavior;
-
-@interface NSWindow (LionSDKDeclarations)
-- (NSWindowAnimationBehavior)animationBehavior;
-- (void)setAnimationBehavior:(NSWindowAnimationBehavior)newAnimationBehavior;
-@end
-
-#endif  // MAC_OS_X_VERSION_10_7
-
 const CGFloat kTearDistance = 36.0;
 const NSTimeInterval kTearDuration = 0.333;