Move all filters-related files from core/platform to platform.

Source/platform/graphics/filters/FEBlend.h

Index: Source/platform/graphics/filters/FEBlend.h
diff --git a/Source/core/platform/graphics/filters/FEBlend.h b/Source/platform/graphics/filters/FEBlend.h
similarity index 97%
rename from Source/core/platform/graphics/filters/FEBlend.h
rename to Source/platform/graphics/filters/FEBlend.h
index 99905ce3f87617c378b04b01fd26fa205d1391b9..628c3ee408fdac81fce7ecf4f14d6882a2876d62 100644
--- a/Source/core/platform/graphics/filters/FEBlend.h
+++ b/Source/platform/graphics/filters/FEBlend.h
@@ -23,9 +23,8 @@
 #ifndef FEBlend_h
 #define FEBlend_h
 
-#include "platform/graphics/filters/FilterEffect.h"
-
 #include "platform/graphics/filters/Filter.h"
+#include "platform/graphics/filters/FilterEffect.h"
 
 namespace WebCore {
 
@@ -38,7 +37,7 @@ enum BlendModeType {
     FEBLEND_MODE_LIGHTEN = 5
 };
 
-class FEBlend : public FilterEffect {
+class PLATFORM_EXPORT FEBlend : public FilterEffect {
 public:
     static PassRefPtr<FEBlend> create(Filter*, BlendModeType);