Remove all the OS X 10.6 SDK forward declarations.

skia/ext/skia_utils_mac.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.
 
 #include "skia/ext/skia_utils_mac.h"
 
 #import <AppKit/AppKit.h>
 
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #include "skia/ext/bitmap_platform_device_mac.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "third_party/skia/include/utils/mac/SkCGUtils.h"
 
-// 10.6 API that we use if available.
-#if !defined(MAC_OS_X_VERSION_10_6) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-
-@interface NSImageRep (NSObject)
-
-- (BOOL)drawInRect:(NSRect)dstSpacePortionRect
-          fromRect:(NSRect)srcSpacePortionRect
-         operation:(NSCompositingOperation)op
-          fraction:(CGFloat)requestedAlpha
-    respectFlipped:(BOOL)respectContextIsFlipped
-             hints:(NSDictionary*)hints;
-
-@end
-
-#endif // OSes < Mac OS X 10.6
-
 namespace {
 
 // Draws an NSImage or an NSImageRep with a given size into a SkBitmap.
 SkBitmap NSImageOrNSImageRepToSkBitmap(
     NSImage* image,
     NSImageRep* image_rep,
     NSSize size,
     bool is_opaque) {
   // Only image or image_rep should be provided, not both.
   DCHECK((image != 0) ^ (image_rep != 0));
@@ skipping 393 matching lines @@
   // Apply content matrix.
   SkMatrix skMatrix = canvas_->getTotalMatrix();
   skMatrix.postTranslate(-SkIntToScalar(pt.fX), -SkIntToScalar(pt.fY));
   CGAffineTransform affine = SkMatrixToCGAffineTransform(skMatrix);
   CGContextConcatCTM(cgContext_, affine);
   
   return cgContext_;
 }
 
 }  // namespace gfx