Loosening the coupling between WebRTC and //third_party/protobuf

webrtc/logging/BUILD.gn

Index: webrtc/logging/BUILD.gn
diff --git a/webrtc/logging/BUILD.gn b/webrtc/logging/BUILD.gn
index 0cf5731bbc6474852d4c767b4b14dc6df6d3ffca..308babf874e3a31834cf4114f0ae6f7b73a17bd1 100644
--- a/webrtc/logging/BUILD.gn
+++ b/webrtc/logging/BUILD.gn
@@ -60,7 +60,10 @@ rtc_static_library("rtc_event_log_impl") {
 
   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).
@@ -96,6 +99,7 @@ if (rtc_enable_protobuf) {
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
     deps = [
+      "../base:protobuf_utils",
       "../base:rtc_base_approved",
     ]
   }