minor changes left out of http://crrev.com/873543002

src/pdf/SkPDFCanon.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkLazyPtr.h"
 #include "SkPDFCanon.h"
 #include "SkPDFFont.h"
@@ skipping 21 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 
 static void assert_mutex_held(const SkPDFCanon* canon, SkBaseMutex& mutex) {
     if (canon == singleton.get()) {
         mutex.assertHeld();
     }
 }
 
 template <class T> T* assert_ptr(T* p) { SkASSERT(p); return p; }
 
-// TODO(halcanary):  add this method to SkTDArray.
 template <typename T>
 bool remove_item(SkTDArray<T>* array, const T& elem) {
     int i = array->find(elem);
     if (i >= 0) {
         array->removeShuffle(i);
         return true;
     }
     return false;
 }
 
@@ skipping 109 matching lines @@
 
 void SkPDFCanon::addGraphicState(SkPDFGraphicState* state) {
     assert_mutex_held(this, gSkPDFCanonPaintMutex);
     fGraphicStateRecords.push(assert_ptr(state));
 }
 
 void SkPDFCanon::removeGraphicState(SkPDFGraphicState* pdfGraphicState) {
     assert_mutex_held(this, gSkPDFCanonPaintMutex);
     SkAssertResult(remove_item(&fGraphicStateRecords, pdfGraphicState));
 }