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/ClockFaceView.cpp b/samplecode/ClockFaceView.cpp
index 4ba65bd..1e21bad 100644
--- a/samplecode/ClockFaceView.cpp
+++ b/samplecode/ClockFaceView.cpp
@@ -75,7 +75,7 @@
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(Dot2DPathEffect)
 
 protected:
-    virtual void begin(const SkIRect& uvBounds, SkPath* dst) const SK_OVERRIDE {
+    void begin(const SkIRect& uvBounds, SkPath* dst) const SK_OVERRIDE {
         if (fPts) {
             fPts->reset();
         }
@@ -90,7 +90,7 @@
         dst->addCircle(loc.fX, loc.fY, fRadius);
     }
 
-    virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
+    void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
         buffer.writeMatrix(this->getMatrix());
         buffer.writeScalar(fRadius);
     }