Refactor read and write buffers.

src/core/SkData.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 "SkData.h"
-#include "SkFlattenableBuffers.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
 #include "SkOSFile.h"
 #include "SkOnce.h"
 
 SkData::SkData(const void* ptr, size_t size, ReleaseProc proc, void* context) {
     fPtr = ptr;
     fSize = size;
     fReleaseProc = proc;
     fReleaseProcContext = context;
 }
 
@@ skipping 132 matching lines @@
 SkData* SkData::NewWithCString(const char cstr[]) {
     size_t size;
     if (NULL == cstr) {
         cstr = "";
         size = 1;
     } else {
         size = strlen(cstr) + 1;
     }
     return NewWithCopy(cstr, size);
 }