Move language detection to a component

chrome/browser/translate/translate_manager.cc

Index: chrome/browser/translate/translate_manager.cc
diff --git a/chrome/browser/translate/translate_manager.cc b/chrome/browser/translate/translate_manager.cc
index c3f7829e85e0f12515cb6f08da7f335677247229..2751f170e25ebf4844ebcb44aa62996b093167a7 100644
--- a/chrome/browser/translate/translate_manager.cc
+++ b/chrome/browser/translate/translate_manager.cc
@@ -33,12 +33,12 @@
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
-#include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/translate/language_detection_details.h"
 #include "chrome/common/url_constants.h"
+#include "components/translate/common/translate_constants.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/navigation_entry.h"
@@ -466,7 +466,7 @@ void TranslateManager::TranslatePage(WebContents* web_contents,
   // server side auto language detection.
   std::string source_lang(original_source_lang);
   if (!IsSupportedLanguage(source_lang))
-    source_lang = std::string(chrome::kUnknownLanguageCode);
+    source_lang = std::string(translate::kUnknownLanguageCode);
 
   Profile* profile =
       Profile::FromBrowserContext(web_contents->GetBrowserContext());
@@ -580,7 +580,7 @@ void TranslateManager::DoTranslatePage(WebContents* web_contents,
 void TranslateManager::PageTranslated(WebContents* web_contents,
                                       PageTranslatedDetails* details) {
   if ((details->error_type == TranslateErrors::NONE) &&
-      details->source_language != chrome::kUnknownLanguageCode &&
+      details->source_language != translate::kUnknownLanguageCode &&
       !IsSupportedLanguage(details->source_language)) {
     details->error_type = TranslateErrors::UNSUPPORTED_LANGUAGE;
   }