FileWrapper[Impl] modifications and actually remove the "Impl" class.

webrtc/common_types.cc

Index: webrtc/common_types.cc
diff --git a/webrtc/common_types.cc b/webrtc/common_types.cc
index d08630b46dd291df0842aa54655c07132336fa47..86e7813e58fe439abc4a61da94cc19d84425bd01 100644
--- a/webrtc/common_types.cc
+++ b/webrtc/common_types.cc
@@ -14,10 +14,6 @@
 
 namespace webrtc {
 
-int InStream::Rewind() { return -1; }
-
-int OutStream::Rewind() { return -1; }
-
 StreamDataCounters::StreamDataCounters() : first_packet_time_ms(-1) {}
 
 RTPHeaderExtension::RTPHeaderExtension()
@@ -40,11 +36,10 @@ RTPHeader::RTPHeader()
       timestamp(0),
       ssrc(0),
       numCSRCs(0),
+      arrOfCSRCs(),
       paddingLength(0),
       headerLength(0),
       payload_type_frequency(0),
-      extension() {
-  memset(&arrOfCSRCs, 0, sizeof(arrOfCSRCs));
-}
+      extension() {}
 
 }  // namespace webrtc