Get rid of extensions dependency from content\browser.

chrome/browser/ui/tab_contents/tab_contents_wrapper.cc

Index: chrome/browser/ui/tab_contents/tab_contents_wrapper.cc
===================================================================
--- chrome/browser/ui/tab_contents/tab_contents_wrapper.cc	(revision 80243)
+++ chrome/browser/ui/tab_contents/tab_contents_wrapper.cc	(working copy)
@@ -11,6 +11,7 @@
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/custom_handlers/register_protocol_handler_infobar_delegate.h"
 #include "chrome/browser/debugger/devtools_handler.h"
+#include "chrome/browser/extensions/extension_tab_helper.h"
 #include "chrome/browser/file_select_helper.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/password_manager/password_manager.h"
@@ -54,6 +55,7 @@
   autocomplete_history_manager_.reset(new AutocompleteHistoryManager(contents));
   autofill_manager_.reset(new AutofillManager(contents));
   dev_tools_tab_helper_.reset(new DevToolsTabHelper(contents));
+  extension_tab_helper_.reset(new ExtensionTabHelper(contents));
   find_tab_helper_.reset(new FindTabHelper(contents));
   password_manager_delegate_.reset(new PasswordManagerDelegateImpl(contents));
   password_manager_.reset(
@@ -186,6 +188,9 @@
 TabContentsWrapper* TabContentsWrapper::Clone() {
   TabContents* new_contents = tab_contents()->Clone();
   TabContentsWrapper* new_wrapper = new TabContentsWrapper(new_contents);
+
+  new_wrapper->extension_tab_helper()->CopyStateFrom(
+      *extension_tab_helper_.get());
   return new_wrapper;
 }