Organize the tab helper file.

chrome/browser/ui/tab_helpers.cc

Index: chrome/browser/ui/tab_helpers.cc
diff --git a/chrome/browser/ui/tab_helpers.cc b/chrome/browser/ui/tab_helpers.cc
index 495f01074f744e324faa8eeadd23e8530b616aad..6bc2d071cb34a516bbaa4ccfa3321d6f4fd0236f 100644
--- a/chrome/browser/ui/tab_helpers.cc
+++ b/chrome/browser/ui/tab_helpers.cc
@@ -147,6 +147,7 @@ void TabHelpers::AttachTabHelpers(WebContents* web_contents) {
       autofill::ChromeAutofillClient::FromWebContents(web_contents));
   ChromeTranslateClient::CreateForWebContents(web_contents);
   CoreTabHelper::CreateForWebContents(web_contents);
+  ExternalProtocolObserver::CreateForWebContents(web_contents);
   favicon::CreateContentFaviconDriverForWebContents(web_contents);
   FindTabHelper::CreateForWebContents(web_contents);
   history::WebContentsTopSitesObserver::CreateForWebContents(
@@ -195,7 +196,6 @@ void TabHelpers::AttachTabHelpers(WebContents* web_contents) {
   ThumbnailTabHelper::CreateForWebContents(web_contents);
   web_modal::WebContentsModalDialogManager::CreateForWebContents(web_contents);
 #endif
-  ExternalProtocolObserver::CreateForWebContents(web_contents);
 
 #if defined(OS_WIN)
   MetroPinTabHelper::CreateForWebContents(web_contents);