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/lerpmode.cpp b/gm/lerpmode.cpp
index 30e6abd..7b567a2 100644
--- a/gm/lerpmode.cpp
+++ b/gm/lerpmode.cpp
@@ -39,15 +39,15 @@
     LerpXfermodeGM() {}
 
 protected:
-    virtual SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() SK_OVERRIDE {
         return SkString("lerpmode");
     }
 
-    virtual SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(240, 120);
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         show_circlelayers(canvas, NULL);
         canvas->translate(150, 0);
         SkAutoTUnref<SkXfermode> mode(SkLerpXfermode::Create(0.5f));