mac: Suppress a clang warning in CustomFrameView.

chrome/browser/ui/cocoa/custom_frame_view.mm

 // Copyright (c) 2012 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/custom_frame_view.h"
 
 #import <Carbon/Carbon.h>
 #include <crt_externs.h>
 #import <objc/runtime.h>
 #include <string.h>
 
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 
 @interface NSView (Swizzles)
 - (NSPoint)_fullScreenButtonOriginOriginal;
 @end
 
 @interface NSWindow (FramedBrowserWindow)
 - (NSPoint)fullScreenButtonOriginAdjustment;
 @end
 
 @interface CustomFrameView : NSView
 
+// Clang emits a warning if designated initializers don't call the super
+// initializer, even if the method raises an exception.
+// http://www.crbug.com/479019.
+- (id)initWithFrame:(NSRect)frame UNAVAILABLE_ATTRIBUTE;
+- (id)initWithCoder:(NSCoder*)coder UNAVAILABLE_ATTRIBUTE;
+
 @end
 
 @implementation CustomFrameView
 
 + (void)load {
   // Swizzling should only happen in the browser process. Interacting with
   // AppKit will run +[borderViewClass initialize] in the renderer, which
   // may establish Mach IPC with com.apple.windowserver.
   // Note that CommandLine has not been initialized yet, since this is running
   // as a module initializer.
@@ skipping 34 matching lines @@
                                           @selector(_fullScreenButtonOrigin));
       Method m2 = class_getInstanceMethod(
           borderViewClass, @selector(_fullScreenButtonOriginOriginal));
       if (m1 && m2) {
         method_exchangeImplementations(m1, m2);
       }
     }
   }
 }
 
-// TODO(erikchen): Clang throws a warning if a designated initializer doesn't
-// call the super initializer, even if the method raises an exception. These
-// pragmas shouldn't be necessary.
-// http://www.crbug.com/479019.
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wobjc-designated-initializers"
 - (id)initWithFrame:(NSRect)frame {
   // This class is not for instantiating.
   [self doesNotRecognizeSelector:_cmd];
   return nil;
 }
 
 - (id)initWithCoder:(NSCoder*)coder {
   // This class is not for instantiating.
   [self doesNotRecognizeSelector:_cmd];
   return nil;
 }
-#pragma clang diagnostic pop
 
 // Override to move the fullscreen button to the left of the profile avatar.
 - (NSPoint)_fullScreenButtonOrigin {
   NSWindow* window = [self window];
   NSPoint offset = NSZeroPoint;
 
   if ([window respondsToSelector:@selector(fullScreenButtonOriginAdjustment)])
     offset = [window fullScreenButtonOriginAdjustment];
 
   NSPoint origin = [self _fullScreenButtonOriginOriginal];
   origin.x += offset.x;
   origin.y += offset.y;
   return origin;
 }
 
 @end