Remove all of WebCore/platform/mac which is not mentioned in WebCore.gypi.

Source/WebCore/platform/mac/WebCoreNSCellExtras.m

Index: Source/WebCore/platform/mac/WebCoreNSCellExtras.m
diff --git a/Source/WebCore/platform/mac/WebCoreNSCellExtras.m b/Source/WebCore/platform/mac/WebCoreNSCellExtras.m
deleted file mode 100644
index 870679bd091b03966afbdaef7f99a7abe244fd50..0000000000000000000000000000000000000000
--- a/Source/WebCore/platform/mac/WebCoreNSCellExtras.m
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
- * THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#import "config.h"
-#import "WebCoreNSCellExtras.h"
-
-#if !BUTTON_CELL_DRAW_WITH_FRAME_DRAWS_FOCUS_RING
-
-@implementation NSCell (WebCoreFocusRingDrawing)
-
-- (void)_web_drawFocusRingWithFrame:(NSRect)cellFrame inView:(NSView *)controlView
-{
-    CGContextRef cgContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
-    CGContextSaveGState(cgContext);
-    NSSetFocusRingStyle(NSFocusRingOnly);
-    CGContextBeginTransparencyLayerWithRect(cgContext, NSRectToCGRect(cellFrame), 0);
-    [self drawFocusRingMaskWithFrame:cellFrame inView:controlView];
-    CGContextEndTransparencyLayer(cgContext);
-    CGContextRestoreGState(cgContext);
-}
-
-@end
-
-#endif // !BUTTON_CELL_DRAW_WITH_FRAME_DRAWS_FOCUS_RING