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/tools/skpdiff/SkPMetric.h b/tools/skpdiff/SkPMetric.h
index 00a3d7a..8f7aa6a 100644
--- a/tools/skpdiff/SkPMetric.h
+++ b/tools/skpdiff/SkPMetric.h
@@ -18,7 +18,7 @@
  */
 class SkPMetric : public SkImageDiffer {
 public:
-    virtual const char* getName() const SK_OVERRIDE { return "perceptual"; }
+    const char* getName() const SK_OVERRIDE { return "perceptual"; }
     virtual bool diff(SkBitmap* baseline, SkBitmap* test, const BitmapsToCreate& bitmapsToCreate,
                       Result* result) const SK_OVERRIDE;