mac: Suppress a clang warning in CustomFrameView.

chrome/browser/ui/cocoa/custom_frame_view.mm

Index: chrome/browser/ui/cocoa/custom_frame_view.mm
diff --git a/chrome/browser/ui/cocoa/custom_frame_view.mm b/chrome/browser/ui/cocoa/custom_frame_view.mm
index 08ae9d42d2656c09fc156a3129b9543d98cd44ca..a745822fd502a9ce933ce18b2ec957f71a3e91dc 100644
--- a/chrome/browser/ui/cocoa/custom_frame_view.mm
+++ b/chrome/browser/ui/cocoa/custom_frame_view.mm
@@ -23,6 +23,12 @@
 
 @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
@@ -77,12 +83,6 @@
   }
 }
 
-// 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];
@@ -94,7 +94,6 @@
   [self doesNotRecognizeSelector:_cmd];
   return nil;
 }
-#pragma clang diagnostic pop
 
 // Override to move the fullscreen button to the left of the profile avatar.
 - (NSPoint)_fullScreenButtonOrigin {