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

src/core/SkEmptyShader.h

Index: src/core/SkEmptyShader.h
diff --git a/src/core/SkEmptyShader.h b/src/core/SkEmptyShader.h
index b7fefbe109c1820b4c2fc3636dd9a6204097e29f..0de85caf5b61b5a4ad309ef1c0b2dac5e14e549a 100644
--- a/src/core/SkEmptyShader.h
+++ b/src/core/SkEmptyShader.h
@@ -20,7 +20,7 @@ class SK_API SkEmptyShader : public SkShader {
 public:
     SkEmptyShader() {}
 
-    virtual size_t contextSize() const SK_OVERRIDE {
+    size_t contextSize() const SK_OVERRIDE {
         // Even though createContext returns NULL we have to return a value of at least
         // sizeof(SkShader::Context) to satisfy SkSmallAllocator.
         return sizeof(SkShader::Context);
@@ -30,7 +30,7 @@ public:
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkEmptyShader)
 
 protected:
-    virtual SkShader::Context* onCreateContext(const ContextRec&, void*) const SK_OVERRIDE {
+    SkShader::Context* onCreateContext(const ContextRec&, void*) const SK_OVERRIDE {
         return NULL;
     }