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/astcbitmap.cpp b/gm/astcbitmap.cpp
index b415a82..808b23e 100644
--- a/gm/astcbitmap.cpp
+++ b/gm/astcbitmap.cpp
@@ -53,15 +53,15 @@
     virtual ~ASTCBitmapGM() { }
 
 protected:
-    virtual SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() SK_OVERRIDE {
         return SkString("astcbitmap");
     }
 
-    virtual SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(kGMDimension, kGMDimension);
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         for (int j = 0; j < 4; ++j) {
             for (int i = 0; i < 4; ++i) {
                 SkString filename = GetResourcePath(get_astc_filename(j*4+i));