Revert 35735 - Relanding the language detection code.

Still causes redness on the reliability bot.

The code would crash if multiple PageContents notifications
were received rapidly.  The CLDHelper now notifies the
TabContents directly and the TabContents ensures only one
language detection can be performed at a time.
Added unittests to validate these cases in web_contents_unittest.cc.

Note that patch set 1 is the original patch, patch set 2 contains the new changes.

Original review:
http://codereview.chromium.org/492024/show

BUG=30662
TEST=Run the unittests.

Review URL: http://codereview.chromium.org/504051

TBR=jcampan@chromium.org
Review URL: http://codereview.chromium.org/523149

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35753 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 32 deletions

diff --git a/chrome/test/ui_test_utils.cc b/chrome/test/ui_test_utils.cc
index e4b5818..6723084 100644
--- a/chrome/test/ui_test_utils.cc
+++ b/chrome/test/ui_test_utils.cc
@@ -254,33 +254,6 @@ class SimpleNotificationObserver : public NotificationObserver {
   DISALLOW_COPY_AND_ASSIGN(SimpleNotificationObserver);
 };
 
-class LanguageDetectionNotificationObserver : public NotificationObserver {
- public:
-  explicit LanguageDetectionNotificationObserver(
-      RenderViewHost* render_view_host) {
-    registrar_.Add(this, NotificationType::TAB_LANGUAGE_DETERMINED,
-                  Source<RenderViewHost>(render_view_host));
-    ui_test_utils::RunMessageLoop();
-  }
-
-  virtual void Observe(NotificationType type,
-                       const NotificationSource& source,
-                       const NotificationDetails& details) {
-    language_ = *(Details<std::string>(details).ptr());
-    MessageLoopForUI::current()->Quit();
-  }
-
-  std::string language() const {
-    return language_;
-  }
-
- private:
-  NotificationRegistrar registrar_;
-  std::string language_;
-
-  DISALLOW_COPY_AND_ASSIGN(LanguageDetectionNotificationObserver);
-};
-
 class FindInPageNotificationObserver : public NotificationObserver {
  public:
   explicit FindInPageNotificationObserver(TabContents* parent_tab)
@@ -511,11 +484,6 @@ void WaitForFocusInBrowser(Browser* browser) {
       browser);
 }
 
-std::string WaitForLanguageDetection(TabContents* tab) {
-  LanguageDetectionNotificationObserver observer(tab->render_view_host());
-  return observer.language();
-}
-
 int FindInPage(TabContents* tab_contents, const string16& search_string,
                bool forward, bool match_case, int* ordinal) {
   tab_contents->StartFinding(search_string, forward, match_case);