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/tests/PixelRefTest.cpp b/tests/PixelRefTest.cpp
index d1d3026..b9a2824 100644
--- a/tests/PixelRefTest.cpp
+++ b/tests/PixelRefTest.cpp
@@ -6,7 +6,7 @@
 class TestListener : public SkPixelRef::GenIDChangeListener {
 public:
     explicit TestListener(int* ptr) : fPtr(ptr) {}
-    virtual void onChange() SK_OVERRIDE { (*fPtr)++; }
+    void onChange() SK_OVERRIDE { (*fPtr)++; }
 private:
     int* fPtr;
 };