Revert r155813 "Reland - cros: Add chat icon to app list"

chrome/browser/ui/app_list/apps_model_builder.cc

Index: chrome/browser/ui/app_list/apps_model_builder.cc
diff --git a/chrome/browser/ui/app_list/apps_model_builder.cc b/chrome/browser/ui/app_list/apps_model_builder.cc
index ccb6c3eda9c98b29255cd8d48870ed49d8483371..9f08c747ef1d21d128f97b8532ff1ed832023917 100644
--- a/chrome/browser/ui/app_list/apps_model_builder.cc
+++ b/chrome/browser/ui/app_list/apps_model_builder.cc
@@ -81,26 +81,6 @@ void AppsModelBuilder::PopulateApps() {
       apps.push_back(new ExtensionAppItem(profile_, *app, controller_));
   }
 
-#if defined(OS_CHROMEOS)
-  // Explicitly add Talk extension if it's installed and enabled.
-  // Add it here instead of in CreateSpecialApps() so it sorts naturally.
-  // Prefer debug > alpha > beta > production version.
-  const char* kTalkIds[] = {
-      extension_misc::kTalkDebugExtensionId,
-      extension_misc::kTalkAlphaExtensionId,
-      extension_misc::kTalkBetaExtensionId,
-      extension_misc::kTalkExtensionId,
-  };
-  for (size_t i = 0; i < arraysize(kTalkIds); ++i) {
-    const Extension* talk = service->GetExtensionById(
-        kTalkIds[i], false /*include_disabled*/);
-    if (talk) {
-      apps.push_back(new ExtensionAppItem(profile_, talk, controller_));
-      break;
-    }
-  }
-#endif  // OS_CHROMEOS
-
   if (apps.empty())
     return;