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/samplecode/SampleArc.cpp b/samplecode/SampleArc.cpp
index 6943eb7..df452ce 100644
--- a/samplecode/SampleArc.cpp
+++ b/samplecode/SampleArc.cpp
@@ -99,7 +99,7 @@
         fRootDrawable = recorder.EXPERIMENTAL_endRecordingAsDrawable();
     }
 
-    virtual ~ArcsView() SK_OVERRIDE {
+    ~ArcsView() SK_OVERRIDE {
         fAnimatingDrawable->unref();
         fRootDrawable->unref();
     }