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/ImageDecodingTest.cpp b/tests/ImageDecodingTest.cpp
index 528c295..78d6b6c 100644
--- a/tests/ImageDecodingTest.cpp
+++ b/tests/ImageDecodingTest.cpp
@@ -760,7 +760,7 @@
     SingleAllocator(void* p, size_t s) : fPixels(p), fSize(s) { }
     ~SingleAllocator() {}
     // If the pixels in fPixels are big enough, use them.
-    virtual bool allocPixelRef(SkBitmap* bm, SkColorTable* ct) SK_OVERRIDE {
+    bool allocPixelRef(SkBitmap* bm, SkColorTable* ct) SK_OVERRIDE {
         SkASSERT(bm);
         if (bm->info().getSafeSize(bm->rowBytes()) <= fSize) {
             bm->setPixels(fPixels, ct);