Speculative fix for crash in DOMUIThumbnailSource.

base/ref_counted_memory.cc

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/ref_counted_memory.h"
+
+const unsigned char* RefCountedStaticMemory::front() const {
+  return data_;
+}
+
+size_t RefCountedStaticMemory::size() const {
+  return length_;
+}
+
+RefCountedBytes* RefCountedBytes::TakeVector(
+    std::vector<unsigned char>* to_destroy) {
+  RefCountedBytes* bytes = new RefCountedBytes;
+  bytes->data.swap(*to_destroy);
+  return bytes;
+}
+
+RefCountedBytes::RefCountedBytes() {
+}
+
+RefCountedBytes::RefCountedBytes(const std::vector<unsigned char>& initializer)
+    : data(initializer) {
+}
+
+const unsigned char* RefCountedBytes::front() const {
+  // STL will assert if we do front() on an empty vector, but calling code
+  // expects a NULL.
+  return size() ? &data.front() : NULL;
+}
+
+size_t RefCountedBytes::size() const {
+  return data.size();
+}