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/gmmain.cpp b/gm/gmmain.cpp
index 6201950..8f6d53a 100644
--- a/gm/gmmain.cpp
+++ b/gm/gmmain.cpp
@@ -174,7 +174,7 @@
 
 class BWTextDrawFilter : public SkDrawFilter {
 public:
-    virtual bool filter(SkPaint*, Type) SK_OVERRIDE;
+    bool filter(SkPaint*, Type) SK_OVERRIDE;
 };
 bool BWTextDrawFilter::filter(SkPaint* p, Type t) {
     if (kText_Type == t) {