Deprecate Extensions.InjectScriptTime histogram

extensions/renderer/script_injection.cc

Index: extensions/renderer/script_injection.cc
diff --git a/extensions/renderer/script_injection.cc b/extensions/renderer/script_injection.cc
index b584f1181d6a161b7d82f5b0ecb7ddea7898e9d6..519dce0ba520efa0ae83a0ab0ad8b745364942e7 100644
--- a/extensions/renderer/script_injection.cc
+++ b/extensions/renderer/script_injection.cc
@@ -316,9 +316,6 @@ void ScriptInjection::InjectJs(std::set<std::string>* executing_scripts,
         world_id, &sources.front(), sources.size(), is_user_gesture, option,
         callback.release());
   }
-
-  if (injection_host_->id().type() == HostID::EXTENSIONS)
-    UMA_HISTOGRAM_TIMES("Extensions.InjectScriptTime", exec_timer.Elapsed());
 }
 
 void ScriptInjection::OnJsInjectionCompleted(