NTP: Fix metrics recording crash by plumbing the necessary data to Java.

components/ntp_tiles.gypi

 # Copyright 2016 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.
 
 {
   'targets': [
     {
       # GN version: //components/ntp_tiles
       'target_name': 'ntp_tiles',
       'type': 'static_library',
@@ skipping 29 matching lines @@
   ],
 
   'conditions': [
     ['OS == "android"', {
       'targets': [
         {
           # GN: //components/ntp_tiles:ntp_tiles_enums_java
           'target_name': 'ntp_tiles_enums_java',
           'type': 'none',
           'variables': {
-            'source_file': 'ntp_tiles/most_visited_sites.cc',
+            'source_file': 'ntp_tiles/most_visited_sites.h',
           },
           'includes': [
             '../build/android/java_cpp_enum.gypi'
           ],
         },
       ],
     }],
   ],
 }