Revert of Loosening the coupling between WebRTC and //third_party/protobuf

webrtc/modules/audio_processing/test/protobuf_utils.h

Index: webrtc/modules/audio_processing/test/protobuf_utils.h
diff --git a/webrtc/modules/audio_processing/test/protobuf_utils.h b/webrtc/modules/audio_processing/test/protobuf_utils.h
index 8941338917114ae167b4abfaf27036c78b5cbd8e..e132c9405cd0c9b796c41ae09037ed84a0e39fa8 100644
--- a/webrtc/modules/audio_processing/test/protobuf_utils.h
+++ b/webrtc/modules/audio_processing/test/protobuf_utils.h
@@ -14,7 +14,6 @@
 #include <memory>
 
 #include "webrtc/base/ignore_wundef.h"
-#include "webrtc/base/protobuf_utils.h"
 
 RTC_PUSH_IGNORING_WUNDEF()
 #include "webrtc/modules/audio_processing/debug.pb.h"
@@ -27,7 +26,7 @@
 size_t ReadMessageBytesFromFile(FILE* file, std::unique_ptr<uint8_t[]>* bytes);
 
 // Returns true on success, false on error or end-of-file.
-bool ReadMessageFromFile(FILE* file, MessageLite* msg);
+bool ReadMessageFromFile(FILE* file, ::google::protobuf::MessageLite* msg);
 
 }  // namespace webrtc