WebView: Add channel info for UMA

ios/chrome/common/BUILD.gn

 # Copyright 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/ios/ios_sdk.gni")
 
 source_set("common") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "channel_info.h",
     "channel_info.mm",
     "material_timing.h",
     "material_timing.mm",
     "string_util.h",
     "string_util.mm",
     "x_callback_url.cc",
     "x_callback_url.h",
   ]
 
   deps = [
     "//base",
     "//components/version_info",
+    "//components/version_info:version_string",
     "//ios/chrome/common/app_group:main_app",
     "//ios/chrome/common/physical_web",
     "//net",
     "//url",
   ]
 
   libs = [ "QuartzCore.framework" ]
 }
 
 source_set("unit_tests") {
@@ skipping 28 matching lines @@
     ":common",
     "//base",
     "//testing/gtest",
   ]
 }
 
 buildflag_header("ios_app_bundle_id_prefix_header") {
   header = "ios_app_bundle_id_prefix.h"
   flags = [ "IOS_APP_BUNDLE_ID_PREFIX=\"$ios_app_bundle_id_prefix\"" ]
 }