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

src/core/SkMaskGamma.cpp

Index: src/core/SkMaskGamma.cpp
diff --git a/src/core/SkMaskGamma.cpp b/src/core/SkMaskGamma.cpp
index a305d72162888ab39420ba4fc29fc1d13e7f1fee..abc729baaec499c3075f6e5891adcee5275cb998 100644
--- a/src/core/SkMaskGamma.cpp
+++ b/src/core/SkMaskGamma.cpp
@@ -12,27 +12,27 @@
 #include "SkMaskGamma.h"
 
 class SkLinearColorSpaceLuminance : public SkColorSpaceLuminance {
-    virtual SkScalar toLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luminance) const SK_OVERRIDE {
+    SkScalar toLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luminance) const SK_OVERRIDE {
         SkASSERT(SK_Scalar1 == gamma);
         return luminance;
     }
-    virtual SkScalar fromLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luma) const SK_OVERRIDE {
+    SkScalar fromLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luma) const SK_OVERRIDE {
         SkASSERT(SK_Scalar1 == gamma);
         return luma;
     }
 };
 
 class SkGammaColorSpaceLuminance : public SkColorSpaceLuminance {
-    virtual SkScalar toLuma(SkScalar gamma, SkScalar luminance) const SK_OVERRIDE {
+    SkScalar toLuma(SkScalar gamma, SkScalar luminance) const SK_OVERRIDE {
         return SkScalarPow(luminance, gamma);
     }
-    virtual SkScalar fromLuma(SkScalar gamma, SkScalar luma) const SK_OVERRIDE {
+    SkScalar fromLuma(SkScalar gamma, SkScalar luma) const SK_OVERRIDE {
         return SkScalarPow(luma, SkScalarInvert(gamma));
     }
 };
 
 class SkSRGBColorSpaceLuminance : public SkColorSpaceLuminance {
-    virtual SkScalar toLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luminance) const SK_OVERRIDE {
+    SkScalar toLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luminance) const SK_OVERRIDE {
         SkASSERT(0 == gamma);
         //The magic numbers are derived from the sRGB specification.
         //See http://www.color.org/chardata/rgb/srgb.xalter .
@@ -42,7 +42,7 @@ class SkSRGBColorSpaceLuminance : public SkColorSpaceLuminance {
         return SkScalarPow((luminance + 0.055f) / 1.055f,
                         2.4f);
     }
-    virtual SkScalar fromLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luma) const SK_OVERRIDE {
+    SkScalar fromLuma(SkScalar SkDEBUGCODE(gamma), SkScalar luma) const SK_OVERRIDE {
         SkASSERT(0 == gamma);
         //The magic numbers are derived from the sRGB specification.
         //See http://www.color.org/chardata/rgb/srgb.xalter .