Add metrics for tracking how Chrome handled shortcut launches

chrome/browser/android/webapps/webapp_metrics.h

Index: chrome/browser/android/webapps/webapp_metrics.h
diff --git a/chrome/browser/android/webapps/webapp_metrics.h b/chrome/browser/android/webapps/webapp_metrics.h
deleted file mode 100644
index 9a0c0c466fae5cc533ba9a8f7134ccff62e9aa9f..0000000000000000000000000000000000000000
--- a/chrome/browser/android/webapps/webapp_metrics.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright (c) 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_ANDROID_WEBAPPS_WEBAPP_METRICS_H_
-#define CHROME_BROWSER_ANDROID_WEBAPPS_WEBAPP_METRICS_H_
-
-#include "base/android/jni_android.h"
-
-namespace webapps {
-
-// Allows logging of WebappActivity-specific metrics.
-class WebappMetrics {
- public:
-  static bool Register(JNIEnv* env);
-};
-
-}  // namespace webapps
-
-#endif  // CHROME_BROWSER_ANDROID_WEBAPPS_WEBAPP_METRICS_H_