Re-factor location bar/toolbar code to get rid of the browser dependency.

chrome/browser/ui/toolbar/toolbar_model_host.h

Index: chrome/browser/ui/toolbar/toolbar_model_host.h
diff --git a/chrome/browser/ui/toolbar/toolbar_model_host.h b/chrome/browser/ui/toolbar/toolbar_model_host.h
new file mode 100644
index 0000000000000000000000000000000000000000..56bfa72dd6582b9846be80a21b9b0d3cacd52067
--- /dev/null
+++ b/chrome/browser/ui/toolbar/toolbar_model_host.h
@@ -0,0 +1,23 @@
+// Copyright (c) 2012 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.
+
+#ifndef CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MODEL_HOST_H_
+#define CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MODEL_HOST_H_
+#pragma once
+
+namespace content {
+class WebContents;
+}
+
+// Interface which ToolbarModel's host should provide.
+class ToolbarModelHost {
+ public:
+  // Returns active WebContents.
+  virtual content::WebContents* GetActiveWebContents() const = 0;
+
+ protected:
+  virtual ~ToolbarModelHost() {}
+};
+
+#endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_MODEL_HOST_H_