Fix up all the easy virtual ... SK_OVERRIDE cases.

src/gpu/effects/GrPorterDuffXferProcessor.cpp

Index: src/gpu/effects/GrPorterDuffXferProcessor.cpp
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.cpp b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
index 2b10cadbf18420ce4057b3e31cfe40a174617f5e..aecf685e6214f2142153f4f410638b9d8bc08f94 100644
--- a/src/gpu/effects/GrPorterDuffXferProcessor.cpp
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
@@ -38,7 +38,7 @@ public:
 
     virtual ~GrGLPorterDuffXferProcessor() {}
 
-    virtual void emitCode(const EmitArgs& args) SK_OVERRIDE {
+    void emitCode(const EmitArgs& args) SK_OVERRIDE {
         const GrPorterDuffXferProcessor& xp = args.fXP.cast<GrPorterDuffXferProcessor>();
         GrGLFPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
         if (xp.hasSecondaryOutput()) {
@@ -86,7 +86,7 @@ public:
         }
     }
 
-    virtual void setData(const GrGLProgramDataManager&, const GrXferProcessor&) SK_OVERRIDE {};
+    void setData(const GrGLProgramDataManager&, const GrXferProcessor&) SK_OVERRIDE {};
 
     static void GenKey(const GrProcessor& processor, const GrGLCaps& caps,
                        GrProcessorKeyBuilder* b) {