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

src/doc/SkDocument_PDF.cpp

Index: src/doc/SkDocument_PDF.cpp
diff --git a/src/doc/SkDocument_PDF.cpp b/src/doc/SkDocument_PDF.cpp
index 834cbc3a96ded17bc16c2ae2a21b4258ca9fcff8..de65efe8c8cdaae59ddd7f0b4a35d464499fdfbc 100644
--- a/src/doc/SkDocument_PDF.cpp
+++ b/src/doc/SkDocument_PDF.cpp
@@ -49,7 +49,7 @@ protected:
         return fCanvas;
     }
 
-    virtual void onEndPage() SK_OVERRIDE {
+    void onEndPage() SK_OVERRIDE {
         SkASSERT(fCanvas);
         SkASSERT(fDevice);
 
@@ -63,7 +63,7 @@ protected:
         fDevice = NULL;
     }
 
-    virtual bool onClose(SkWStream* stream) SK_OVERRIDE {
+    bool onClose(SkWStream* stream) SK_OVERRIDE {
         SkASSERT(NULL == fCanvas);
         SkASSERT(NULL == fDevice);
 
@@ -73,7 +73,7 @@ protected:
         return success;
     }
 
-    virtual void onAbort() SK_OVERRIDE {
+    void onAbort() SK_OVERRIDE {
         SkDELETE(fDoc);
         fDoc = NULL;
     }