GetScaleFactorForNativeView should return scale factor in float

content/public/browser/web_ui.h

 // 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 CONTENT_PUBLIC_BROWSER_WEB_UI_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_UI_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "content/public/common/page_transition_types.h"
-#include "ui/base/layout.h"
 
 class GURL;
 
 namespace base {
 class ListValue;
 class Value;
 }
 
 namespace content {
 
@@ skipping 22 matching lines @@
   virtual ~WebUI() {}
 
   virtual WebContents* GetWebContents() const = 0;
 
   virtual WebUIController* GetController() const = 0;
   virtual void SetController(WebUIController* controller) = 0;
 
   // Returns the device scale factor of the monitor that the renderer is on.
   // Whenever possible, WebUI should push resources with this scale factor to
   // Javascript.
-  virtual ui::ScaleFactor GetDeviceScaleFactor() const = 0;
+  virtual float GetDeviceScaleFactor() const = 0;
 
   // Gets a custom tab title provided by the Web UI. If there is no title
   // override, the string will be empty which should trigger the default title
   // behavior for the tab.
   virtual const base::string16& GetOverriddenTitle() const = 0;
   virtual void OverrideTitle(const base::string16& title) = 0;
 
   // Returns the transition type that should be used for link clicks on this
   // Web UI. This will default to LINK but may be overridden.
   virtual PageTransition GetLinkTransitionType() const = 0;
@@ skipping 47 matching lines @@
                                       const base::Value& arg3,
                                       const base::Value& arg4) = 0;
   virtual void CallJavascriptFunction(
       const std::string& function_name,
       const std::vector<const base::Value*>& args) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_UI_H_