Extract executeScript-like functionality into a single ExtensionScriptExecutor class.

chrome/browser/ui/tab_contents/tab_contents_wrapper.h

Index: chrome/browser/ui/tab_contents/tab_contents_wrapper.h
diff --git a/chrome/browser/ui/tab_contents/tab_contents_wrapper.h b/chrome/browser/ui/tab_contents/tab_contents_wrapper.h
index 3fc5e14ef66cd57737255cc285abaf671cf706b4..e128c85e38fda122649c042ab5694bb7b0eb8e4b 100644
--- a/chrome/browser/ui/tab_contents/tab_contents_wrapper.h
+++ b/chrome/browser/ui/tab_contents/tab_contents_wrapper.h
@@ -56,6 +56,7 @@ class SyncedTabDelegate;
 }
 
 namespace extensions {
+class ScriptExecutor;
 class WebNavigationTabObserver;
 }
 
@@ -132,6 +133,10 @@ class TabContentsWrapper : public content::WebContentsObserver {
 
   CoreTabHelper* core_tab_helper() { return core_tab_helper_.get(); }
 
+  extensions::ScriptExecutor* extension_script_executor() {
+    return extension_script_executor_.get();
+  }
+
   ExtensionTabHelper* extension_tab_helper() {
     return extension_tab_helper_.get();
   }
@@ -228,6 +233,7 @@ class TabContentsWrapper : public content::WebContentsObserver {
   scoped_ptr<BookmarkTabHelper> bookmark_tab_helper_;
   scoped_ptr<ConstrainedWindowTabHelper> constrained_window_tab_helper_;
   scoped_ptr<CoreTabHelper> core_tab_helper_;
+  scoped_ptr<extensions::ScriptExecutor> extension_script_executor_;
   scoped_ptr<ExtensionTabHelper> extension_tab_helper_;
   scoped_ptr<FaviconTabHelper> favicon_tab_helper_;
   scoped_ptr<FindTabHelper> find_tab_helper_;