Remove Cairo support.

Source/WebCore/platform/graphics/Gradient.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  *
  * 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
@@ skipping 222 matching lines @@
 {
     if (m_gradientSpaceTransformation == gradientSpaceTransformation)
         return;
 
     m_gradientSpaceTransformation = gradientSpaceTransformation;
     setPlatformGradientSpaceTransform(gradientSpaceTransformation);
 
     invalidateHash();
 }
 
-#if !USE(SKIA) && !USE(CAIRO) && !PLATFORM(BLACKBERRY)
+#if !USE(SKIA) && !PLATFORM(BLACKBERRY)
 void Gradient::setPlatformGradientSpaceTransform(const AffineTransform&)
 {
 }
 #endif
 
 unsigned Gradient::hash() const
 {
     if (m_cachedHash)
         return m_cachedHash;
 
@@ skipping 28 matching lines @@
 
     unsigned parametersHash = StringHasher::hashMemory(&parameters, sizeof(parameters));
     unsigned stopHash = StringHasher::hashMemory(m_stops.data(), m_stops.size() * sizeof(ColorStop));
 
     m_cachedHash = pairIntHash(parametersHash, stopHash);
 
     return m_cachedHash;
 }
 
 } //namespace