Loosening the coupling between WebRTC and //third_party/protobuf

webrtc/logging/BUILD.gn

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../webrtc.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 42 matching lines @@
     "..:webrtc_common",
     "../base:rtc_base_approved",
     "../call:call_interfaces",
     "../modules/audio_coding:audio_network_adaptor",
     "../modules/rtp_rtcp",
     "../system_wrappers",
   ]
 
   if (rtc_enable_protobuf) {
     defines += [ "ENABLE_RTC_EVENT_LOG" ]
-    deps += [ ":rtc_event_log_proto" ]
+    deps += [
+      ":rtc_event_log_proto",
+      "../base:protobuf_utils",
+    ]
   }
   if (!build_with_chromium && is_clang) {
     # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
 }
 
 if (rtc_enable_protobuf) {
   proto_library("rtc_event_log_proto") {
     sources = [
@@ skipping 15 matching lines @@
       "../call:call_interfaces",
       "../modules/rtp_rtcp:rtp_rtcp",
       "../system_wrappers",
     ]
 
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
     deps = [
+      "../base:protobuf_utils",
       "../base:rtc_base_approved",
     ]
   }
 
   if (rtc_include_tests) {
     rtc_source_set("rtc_event_log_tests") {
       testonly = true
       sources = [
         "rtc_event_log/ringbuffer_unittest.cc",
         "rtc_event_log/rtc_event_log_unittest.cc",
@@ skipping 57 matching lines @@
         "../modules/rtp_rtcp:rtp_rtcp",
         "//third_party/gflags",
       ]
       if (!build_with_chromium && is_clang) {
         # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
         suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
       }
     }
   }
 }