Remove BrowserList::GetLastActive usage from WebUI pages.

ui/web_dialogs/constrained_web_dialog_ui.h

Index: ui/web_dialogs/constrained_web_dialog_ui.h
===================================================================
--- ui/web_dialogs/constrained_web_dialog_ui.h	(revision 142088)
+++ ui/web_dialogs/constrained_web_dialog_ui.h	(working copy)
@@ -13,7 +13,6 @@
 class ConstrainedWindow;
 class Profile;
 class TabContents;
-typedef TabContents TabContentsWrapper;
 class WebDialogWebContentsDelegate;
 
 namespace base {
@@ -42,10 +41,12 @@
   virtual void ReleaseTabContentsOnDialogClose() = 0;
 
   // Returns the ConstrainedWindow.
+  // TODO: fix this function name and the one below to conform to the style
+  // guide (i.e. GetWindow, GetTab).
   virtual ConstrainedWindow* window() = 0;
 
-  // Returns the TabContentsWrapper owned by the constrained window.
-  virtual TabContentsWrapper* tab() = 0;
+  // Returns the TabContents owned by the constrained window.
+  virtual TabContents* tab() = 0;
 
  protected:
   virtual ~ConstrainedWebDialogDelegate() {}
@@ -100,7 +101,7 @@
     Profile* profile,
     WebDialogDelegate* delegate,
     WebDialogWebContentsDelegate* tab_delegate,
-    TabContentsWrapper* overshadowed);
+    TabContents* overshadowed);
 
 }  // namespace ui