Moving GraphicsContext and dependencies from core to platform.

Source/platform/image-decoders/gif/GIFImageReader.h

Index: Source/platform/image-decoders/gif/GIFImageReader.h
diff --git a/Source/core/platform/image-decoders/gif/GIFImageReader.h b/Source/platform/image-decoders/gif/GIFImageReader.h
similarity index 97%
rename from Source/core/platform/image-decoders/gif/GIFImageReader.h
rename to Source/platform/image-decoders/gif/GIFImageReader.h
index 616f6e69e538978d7aaddcda1ca601ba7cae4d45..0464bb09013d3a5daf9ce0393fa7a2081355bce8 100644
--- a/Source/core/platform/image-decoders/gif/GIFImageReader.h
+++ b/Source/platform/image-decoders/gif/GIFImageReader.h
@@ -41,7 +41,8 @@
 // Define ourselves as the clientPtr.  Mozilla just hacked their C++ callback class into this old C decoder,
 // so we will too.
 #include "platform/SharedBuffer.h"
-#include "core/platform/image-decoders/gif/GIFImageDecoder.h"
+#include "platform/image-decoders/gif/GIFImageDecoder.h"
+#include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
@@ -178,7 +179,7 @@ private:
 
 // Frame output state machine.
 struct GIFFrameContext {
-    WTF_MAKE_FAST_ALLOCATED;
+    WTF_MAKE_FAST_ALLOCATED; WTF_MAKE_NONCOPYABLE(GIFFrameContext);
 public:
     GIFFrameContext(int id)
         : m_frameId(id)
@@ -274,8 +275,8 @@ private:
     bool m_isDataSizeDefined;
 };
 
-class GIFImageReader {
-    WTF_MAKE_FAST_ALLOCATED;
+class PLATFORM_EXPORT GIFImageReader {
+    WTF_MAKE_FAST_ALLOCATED; WTF_MAKE_NONCOPYABLE(GIFImageReader);
 public:
     GIFImageReader(WebCore::GIFImageDecoder* client = 0)
         : m_client(client)