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

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index 3285e220de345a4940f5ec6c28d2600cfbb340dd..34b1b9bc3e88557043c494dd1a80d5068b1132e5 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -432,7 +432,7 @@ public:
         }
         SK_DECLARE_INTERNAL_LLIST_INTERFACE(Value);
     };
-    virtual bool get(const Key& key, SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE {
+    bool get(const Key& key, SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE {
         SkAutoMutexAcquire mutex(fMutex);
         if (Value* v = fLookup.find(key)) {
             *result = v->fBitmap;
@@ -445,7 +445,7 @@ public:
         }
         return false;
     }
-    virtual void set(const Key& key, const SkBitmap& result, const SkIPoint& offset) SK_OVERRIDE {
+    void set(const Key& key, const SkBitmap& result, const SkIPoint& offset) SK_OVERRIDE {
         SkAutoMutexAcquire mutex(fMutex);
         if (Value* v = fLookup.find(key)) {
             removeInternal(v);