Migrate HostZoomMap to live in StoragePartition.

content/browser/host_zoom_level_context.cc

+// Copyright 2014 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 "content/browser/host_zoom_level_context.h"
+
+#include "base/files/file_path.h"
+#include "content/browser/host_zoom_map_impl.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+HostZoomLevelContext::HostZoomLevelContext(
+    scoped_ptr<ZoomLevelDelegate> zoom_level_delegate)
+    : host_zoom_map_impl_(new HostZoomMapImpl()),
+      zoom_level_delegate_(zoom_level_delegate.Pass()) {
+  if (zoom_level_delegate_)
+    zoom_level_delegate_->InitHostZoomMap(host_zoom_map_impl_.get());
+}
+
+HostZoomLevelContext::~HostZoomLevelContext() {}
+
+void HostZoomLevelContext::DeleteOnCorrectThread() const {
+  if (BrowserThread::IsMessageLoopValid(BrowserThread::UI) &&
+      !BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+    BrowserThread::DeleteSoon(BrowserThread::UI, FROM_HERE, this);
+    return;
+  }
+  delete this;
+}
+
+}  // namespace content