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/SampleAll.cpp b/samplecode/SampleAll.cpp
index f5a7c14..537659e 100644
--- a/samplecode/SampleAll.cpp
+++ b/samplecode/SampleAll.cpp
@@ -168,11 +168,11 @@
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(Dot2DPathEffect)
 
 protected:
-    virtual void next(const SkPoint& loc, int u, int v, SkPath* dst) const SK_OVERRIDE {
+    void next(const SkPoint& loc, int u, int v, SkPath* dst) const SK_OVERRIDE {
         dst->addCircle(loc.fX, loc.fY, fRadius);
     }
 
-    virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
+    void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
         this->INHERITED::flatten(buffer);
         buffer.writeScalar(fRadius);
     }