Move histogram_manager from components/metrics to components/cronet

components/cronet/cronet_static.gypi

 # Copyright 2014 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.
 
 {
   # This target is included into both 'cronet_static' and 'cronet_static_small'.
   'type': 'static_library',
   'dependencies': [
     '../base/base.gyp:base',
     '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
@@ skipping 23 matching lines @@
     'android/cronet_url_request_adapter.cc',
     'android/cronet_url_request_adapter.h',
     'android/cronet_url_request_context_adapter.cc',
     'android/cronet_url_request_context_adapter.h',
     'android/url_request_adapter.cc',
     'android/url_request_adapter.h',
     'android/url_request_context_adapter.cc',
     'android/url_request_context_adapter.h',
     'android/wrapped_channel_upload_element_reader.cc',
     'android/wrapped_channel_upload_element_reader.h',
+    'histogram_manager.cc',
+    'histogram_manager.h',
     'url_request_context_config.cc',
     'url_request_context_config.h',
     'url_request_context_config_list.h',
   ],
   'cflags': [
     '-DLOGGING=1',
     '-fdata-sections',
     '-ffunction-sections',
     '-fno-rtti',
     '-fvisibility=hidden',
     '-fvisibility-inlines-hidden',
     '-Wno-sign-promo',
     '-Wno-missing-field-initializers',
   ],
   'ldflags': [
     '-llog',
     '-landroid',
     '-Wl,--gc-sections',
     '-Wl,--exclude-libs,ALL'
   ],
 }