devtools: avoid relying on the internal variables for browser

chrome/browser/devtools/devtools_window.h

Index: chrome/browser/devtools/devtools_window.h
diff --git a/chrome/browser/devtools/devtools_window.h b/chrome/browser/devtools/devtools_window.h
index c95bffb2e5132964fbd4597ffb4a02144d47e612..39950c1f869152c611ccc831d8d29f5db3ca2602 100644
--- a/chrome/browser/devtools/devtools_window.h
+++ b/chrome/browser/devtools/devtools_window.h
@@ -297,7 +297,7 @@ class DevToolsWindow : public DevToolsUIBindings::Delegate,
   InfoBarService* GetInfoBarService() override;
   void RenderProcessGone(bool crashed) override;
 
-  void CreateDevToolsBrowser();
+  Browser* CreateDevToolsBrowser();
   BrowserWindow* GetInspectedBrowserWindow();
   void ScheduleShow(const DevToolsToggleAction& action);
   void Show(const DevToolsToggleAction& action);
@@ -305,6 +305,10 @@ class DevToolsWindow : public DevToolsUIBindings::Delegate,
   void LoadCompleted();
   void UpdateBrowserToolbar();
   void UpdateBrowserWindow();
+  Browser* GetBrowser();
+  bool IsDocked();
+  void DetachFromBrowser();
+
   content::WebContents* GetInspectedWebContents();
 
   scoped_ptr<ObserverWithAccessor> inspected_contents_observer_;
@@ -313,8 +317,7 @@ class DevToolsWindow : public DevToolsUIBindings::Delegate,
   content::WebContents* main_web_contents_;
   content::WebContents* toolbox_web_contents_;
   DevToolsUIBindings* bindings_;
-  Browser* browser_;
-  bool is_docked_;
+  bool dock_requested_;
   const bool can_dock_;
   LifeStage life_stage_;
   DevToolsToggleAction action_on_load_;