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

Source/core/platform/graphics/filters/SourceAlpha.h

Index: Source/core/platform/graphics/filters/SourceAlpha.h
diff --git a/Source/core/platform/graphics/filters/SourceAlpha.h b/Source/core/platform/graphics/filters/SourceAlpha.h
deleted file mode 100644
index 3a60df63ce84d02ed0b46b9c7f890e3550c2cf8b..0000000000000000000000000000000000000000
--- a/Source/core/platform/graphics/filters/SourceAlpha.h
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
- * Copyright (C) 2013 Google Inc. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifndef SourceAlpha_h
-#define SourceAlpha_h
-
-#include "platform/graphics/filters/Filter.h"
-#include "platform/graphics/filters/FilterEffect.h"
-
-namespace WebCore {
-
-class SourceAlpha : public FilterEffect {
-public:
-    static PassRefPtr<SourceAlpha> create(Filter*);
-
-    static const AtomicString& effectName();
-
-    virtual void determineAbsolutePaintRect();
-
-    virtual FilterEffectType filterEffectType() const { return FilterEffectTypeSourceInput; }
-
-    virtual TextStream& externalRepresentation(TextStream&, int indention) const;
-
-private:
-    SourceAlpha(Filter* filter)
-        : FilterEffect(filter)
-    {
-    }
-
-    virtual void applySoftware() OVERRIDE;
-};
-
-} //namespace WebCore
-
-#endif // SourceAlpha_h