Removing unused SetBrowserContext

content/public/browser/navigation_controller.h

Index: content/public/browser/navigation_controller.h
diff --git a/content/public/browser/navigation_controller.h b/content/public/browser/navigation_controller.h
index e3673d123090619ef6eda93f030394ff8831a83c..a2f4714d985dbacb5bbbd0d6a7d7f13f0cba3bb0 100644
--- a/content/public/browser/navigation_controller.h
+++ b/content/public/browser/navigation_controller.h
@@ -224,23 +224,22 @@ class NavigationController {
   // Disables checking for a repost and prompting the user. This is used during
   // testing.
   CONTENT_EXPORT static void DisablePromptOnRepost();
 
   virtual ~NavigationController() {}
 
   // Returns the web contents associated with this controller. It can never be
   // nullptr.
   virtual WebContents* GetWebContents() const = 0;
 
-  // Get/set the browser context for this controller. It can never be nullptr.
+  // Get the browser context for this controller. It can never be nullptr.
   virtual BrowserContext* GetBrowserContext() const = 0;
-  virtual void SetBrowserContext(BrowserContext* browser_context) = 0;
 
   // Initializes this NavigationController with the given saved navigations,
   // using |selected_navigation| as the currently loaded entry. Before this call
   // the controller should be unused (there should be no current entry). |type|
   // indicates where the restor comes from. This takes ownership of the
   // NavigationEntrys in |entries| and clears it out. This is used for session
   // restore.
   virtual void Restore(
       int selected_navigation,
       RestoreType type,