[Mac] Remove -[NSWindow drawRect] swizzling.

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 3628c1a29fbf83e24d4acabdaf0cbcb510ef9fc3..acfff1ffe5b4ce9f95a4488b8e76b425aa86c140 100644
--- a/chrome/browser/ui/cocoa/custom_frame_view.mm
+++ b/chrome/browser/ui/cocoa/custom_frame_view.mm
@@ -13,13 +13,7 @@
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 
-namespace {
-BOOL gCanDrawTitle = NO;
-BOOL gCanGetCornerRadius = NO;
-}  // namespace
-
 @interface NSView (Swizzles)
-- (void)drawRectOriginal:(NSRect)rect;
 - (NSPoint)_fullScreenButtonOriginOriginal;
 @end
 
@@ -27,23 +21,12 @@ BOOL gCanGetCornerRadius = NO;
 - (NSPoint)fullScreenButtonOriginAdjustment;
 @end
 
-@implementation NSWindow (CustomFrameView)
-- (void)drawCustomFrameRect:(NSRect)rect forView:(NSView*)view {
-  [view drawRectOriginal:rect];
-}
-@end
-
 @interface CustomFrameView : NSView
 
 @end
 
 @implementation CustomFrameView
 
-// This is where we swizzle drawRect, and add in two methods that we
-// need. If any of these fail it shouldn't affect the functionality of the
-// others. If they all fail, we will lose window frame theming and
-// roll overs for our close widgets, but things should still function
-// correctly.
 + (void)load {
   // Swizzling should only happen in the browser process. Interacting with
   // AppKit will run +[borderViewClass initialize] in the renderer, which
@@ -59,6 +42,11 @@ BOOL gCanGetCornerRadius = NO;
       return;
   }
 
+  // In Yosemite, the fullscreen button replaces the zoom button. We no longer
+  // need to swizzle out this AppKit private method.
+  if (!base::mac::IsOSMavericksOrEarlier())
+    return;
+
   base::mac::ScopedNSAutoreleasePool pool;
 
   // On 10.8+ the background for textured windows are no longer drawn by
@@ -68,58 +56,25 @@ BOOL gCanGetCornerRadius = NO;
   DCHECK(borderViewClass);
   if (!borderViewClass) return;
 
-  // Exchange draw rect.
-  Method m0 = class_getInstanceMethod([self class], @selector(drawRect:));
-  DCHECK(m0);
+  // Swizzle the method that sets the origin for the Lion fullscreen button.
+  // Do nothing if it cannot be found.
+  Method m0 = class_getInstanceMethod([self class],
+                               @selector(_fullScreenButtonOrigin));
   if (m0) {
     BOOL didAdd = class_addMethod(borderViewClass,
-                                  @selector(drawRectOriginal:),
+                                  @selector(_fullScreenButtonOriginOriginal),
                                   method_getImplementation(m0),
                                   method_getTypeEncoding(m0));
-    DCHECK(didAdd);
     if (didAdd) {
       Method m1 = class_getInstanceMethod(borderViewClass,
-                                          @selector(drawRect:));
-      Method m2 = class_getInstanceMethod(borderViewClass,
-                                          @selector(drawRectOriginal:));
-      DCHECK(m1 && m2);
+                                          @selector(_fullScreenButtonOrigin));
+      Method m2 = class_getInstanceMethod(
+          borderViewClass, @selector(_fullScreenButtonOriginOriginal));
       if (m1 && m2) {
         method_exchangeImplementations(m1, m2);
       }
     }
   }
-
-  // In Yosemite, the fullscreen button replaces the zoom button. We no longer
-  // need to swizzle out this AppKit private method.
-  if (base::mac::IsOSMavericksOrEarlier()) {
-    // Swizzle the method that sets the origin for the Lion fullscreen button.
-    // Do nothing if it cannot be found.
-    m0 = class_getInstanceMethod([self class],
-                                 @selector(_fullScreenButtonOrigin));
-    if (m0) {
-      BOOL didAdd = class_addMethod(borderViewClass,
-                                    @selector(_fullScreenButtonOriginOriginal),
-                                    method_getImplementation(m0),
-                                    method_getTypeEncoding(m0));
-      if (didAdd) {
-        Method m1 = class_getInstanceMethod(borderViewClass,
-                                            @selector(_fullScreenButtonOrigin));
-        Method m2 = class_getInstanceMethod(
-            borderViewClass, @selector(_fullScreenButtonOriginOriginal));
-        if (m1 && m2) {
-          method_exchangeImplementations(m1, m2);
-        }
-      }
-    }
-  }
-}
-
-+ (BOOL)canDrawTitle {
-  return gCanDrawTitle;
-}
-
-+ (BOOL)canGetCornerRadius {
-  return gCanGetCornerRadius;
 }
 
 - (id)initWithFrame:(NSRect)frame {
@@ -134,13 +89,6 @@ BOOL gCanGetCornerRadius = NO;
   return nil;
 }
 
-// Here is our custom drawing for our frame.
-- (void)drawRect:(NSRect)rect {
-  // Delegate drawing to the window, whose default implementation (above) is to
-  // call into the original implementation.
-  [[self window] drawCustomFrameRect:rect forView:self];
-}
-
 // Override to move the fullscreen button to the left of the profile avatar.
 - (NSPoint)_fullScreenButtonOrigin {
   NSWindow* window = [self window];