More build config cleanup.

skia/ext/bitmap_platform_device.h

 // 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.
 
 #ifndef SKIA_EXT_BITMAP_PLATFORM_DEVICE_H_
 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_H_
 
 // This file provides an easy way to include the appropriate
 // BitmapPlatformDevice header file for your platform.
 
 #if defined(WIN32)
 #include "skia/ext/bitmap_platform_device_win.h"
 #elif defined(__APPLE__)
 #include "skia/ext/bitmap_platform_device_mac.h"
-#elif defined(USE_CAIRO)
-#include "skia/ext/bitmap_platform_device_cairo.h"
 #else
 #include "skia/ext/bitmap_platform_device_skia.h"
 #endif
 
 namespace skia {
     // Returns true if it is unsafe to attempt to allocate an offscreen buffer
     // given these dimensions.
     inline bool RasterDeviceTooBigToAllocate(int width, int height) {
 
 #ifndef SKIA_EXT_RASTER_DEVICE_ALLOCATION_MAX
 #define SKIA_EXT_RASTER_DEVICE_ALLOCATION_MAX    (2 * 256 * 1024 * 1024)
 #endif
 
     int bytesPerPixel = 4;
     int64_t bytes = (int64_t)width * height * bytesPerPixel;
     return bytes > SKIA_EXT_RASTER_DEVICE_ALLOCATION_MAX;
   }
 }
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_H_