mac: Remove code that was only needed on 10.5

chrome/browser/ui/cocoa/tracking_area.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/tracking_area.h"
 
 #include "base/logging.h"
 
 // NSTrackingArea does not retain its |owner| so CrTrackingArea wraps the real
 // owner in this proxy, which can stop forwarding messages to the owner when
@@ skipping 50 matching lines @@
 
 @interface CrTrackingArea (Private)
 - (void)windowWillClose:(NSNotification*)notif;
 @end
 
 ////////////////////////////////////////////////////////////////////////////////
 
 @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];
   [super dealloc];
 }
 
 - (void)clearOwner {
   [ownerProxy_ setAlive:NO];
 }
 
@@ skipping 22 matching lines @@
   [tracking_area_ clearOwner];
 }
 
 void ScopedCrTrackingArea::reset(CrTrackingArea* tracking_area) {
   tracking_area_.reset(tracking_area);
 }
 
 CrTrackingArea* ScopedCrTrackingArea::get() const {
   return tracking_area_.get();
 }