mac: Remove code that was only needed on 10.5

chrome/browser/ui/cocoa/tracking_area.mm

Index: chrome/browser/ui/cocoa/tracking_area.mm
diff --git a/chrome/browser/ui/cocoa/tracking_area.mm b/chrome/browser/ui/cocoa/tracking_area.mm
index ac638b853f71536e4106261823218d8639964b2f..004695bc7dedd8b5d5d2ebee6fd75ed146ed6a57 100644
--- a/chrome/browser/ui/cocoa/tracking_area.mm
+++ b/chrome/browser/ui/cocoa/tracking_area.mm
@@ -68,29 +68,20 @@
 @implementation CrTrackingArea
 
 - (id)initWithRect:(NSRect)rect
-           options:(NSTrackingAreaOptions)options
-      proxiedOwner:(id)owner
-          userInfo:(NSDictionary*)userInfo {
+                        options:(NSTrackingAreaOptions)options
+                          owner:(id)owner
+                       userInfo:(NSDictionary*)userInfo {
   scoped_nsobject<CrTrackingAreaOwnerProxy> ownerProxy(
       [[CrTrackingAreaOwnerProxy alloc] initWithOwner:owner]);
-  if ((self = static_cast<id>([super initWithRect:rect
-                                          options:options
-                                            owner:ownerProxy.get()
-                                         userInfo:userInfo]))) {
+  if ((self = [super initWithRect:rect
+                          options:options
+                            owner:ownerProxy.get()
+                         userInfo:userInfo])) {
     ownerProxy_.swap(ownerProxy);
   }
   return self;
 }
 
-- (NSTrackingArea*)initWithRect:(NSRect)rect
-                        options:(NSTrackingAreaOptions)options
-                          owner:(id)owner
-                       userInfo:(NSDictionary*)userInfo {
-  [NSException raise:@"org.chromium.CrTrackingArea"
-      format:@"Cannot init a CrTrackingArea with NSTrackingArea's initializer"];
-  return nil;
-}
-
 - (void)dealloc {
   [self clearOwner];
   [[NSNotificationCenter defaultCenter] removeObserver:self];