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

This fixes every case where virtual and SK_OVERRIDE were on the same line,
which should be the bulk of cases.  We'll have to manually clean up the rest
over time unless I level up in regexes.

for f in (find . -type f); perl -p -i -e 's/virtual (.*)SK_OVERRIDE/\1SK_OVERRIDE/g' $f; end

BUG=skia:

Review URL: https://codereview.chromium.org/806653007
diff --git a/gm/discard.cpp b/gm/discard.cpp
index ff8fe4a..58a0849 100644
--- a/gm/discard.cpp
+++ b/gm/discard.cpp
@@ -25,18 +25,18 @@
     DiscardGM() {
     }
 
-    virtual uint32_t onGetFlags() const SK_OVERRIDE { return kGPUOnly_Flag; }
+    uint32_t onGetFlags() const SK_OVERRIDE { return kGPUOnly_Flag; }
 
 protected:
-    virtual SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() SK_OVERRIDE {
         return SkString("discard");
     }
 
-    virtual SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(100, 100);
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         GrContext* context = canvas->getGrContext();
         if (NULL == context) {
             return;