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/SkCLImageDiffer.h b/tools/skpdiff/SkCLImageDiffer.h
index 56eccfb..177940d 100644
--- a/tools/skpdiff/SkCLImageDiffer.h
+++ b/tools/skpdiff/SkCLImageDiffer.h
@@ -26,7 +26,7 @@
 public:
     SkCLImageDiffer();
 
-    virtual bool requiresOpenCL() const SK_OVERRIDE { return true; }
+    bool requiresOpenCL() const SK_OVERRIDE { return true; }
 
     /**
      * Initializes the OpenCL resources this differ needs to work