Update more directories under src/ to follow C++11 style rule for {virtual,override}.

src/doc/SkDocument_PDF.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDocument.h"
 #include "SkPDFCanon.h"
 #include "SkPDFDevice.h"
@@ skipping 287 matching lines @@
                    SkScalar rasterDpi)
         : SkDocument(stream, doneProc)
         , fRasterDpi(rasterDpi) {}
 
     virtual ~SkDocument_PDF() {
         // subclasses must call close() in their destructors
         this->close();
     }
 
 protected:
-    virtual SkCanvas* onBeginPage(SkScalar width, SkScalar height,
-                                  const SkRect& trimBox) override {
+    SkCanvas* onBeginPage(SkScalar width, SkScalar height,
+                          const SkRect& trimBox) override {
         SkASSERT(!fCanvas.get());
 
         SkISize pageSize = SkISize::Make(
                 SkScalarRoundToInt(width), SkScalarRoundToInt(height));
         SkAutoTUnref<SkPDFDevice> device(
                 SkPDFDevice::Create(pageSize, fRasterDpi, &fCanon));
         fCanvas.reset(SkNEW_ARGS(SkCanvas, (device.get())));
         fPageDevices.push(device.detach());
         fCanvas->clipRect(trimBox);
         fCanvas->translate(trimBox.x(), trimBox.y());
@@ skipping 35 matching lines @@
 
 SkDocument* SkDocument::CreatePDF(const char path[], SkScalar dpi) {
     SkFILEWStream* stream = SkNEW_ARGS(SkFILEWStream, (path));
     if (!stream->isValid()) {
         SkDELETE(stream);
         return NULL;
     }
     auto delete_wstream = [](SkWStream* stream, bool) { SkDELETE(stream); };
     return SkNEW_ARGS(SkDocument_PDF, (stream, delete_wstream, dpi));
 }