Address some violations of chromium-style.

webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
index 81b46f8abf9e2edf6ffca3c54ffd986e1ab8f072..e8f010c8acedcfb5934e7bece9defa402e331e8b 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
@@ -384,32 +384,44 @@ class RtcpRttStats {
 // Null object version of RtpFeedback.
 class NullRtpFeedback : public RtpFeedback {
  public:
-  virtual ~NullRtpFeedback() {}
+  ~NullRtpFeedback() override {}
 
   int32_t OnInitializeDecoder(int8_t payload_type,
                               const char payloadName[RTP_PAYLOAD_NAME_SIZE],
                               int frequency,
                               size_t channels,
-                              uint32_t rate) override {
-    return 0;
-  }
+                              uint32_t rate) override;
 
   void OnIncomingSSRCChanged(uint32_t ssrc) override {}
   void OnIncomingCSRCChanged(uint32_t csrc, bool added) override {}
 };
 
+inline int32_t NullRtpFeedback::OnInitializeDecoder(
+    int8_t payload_type,
+    const char payloadName[RTP_PAYLOAD_NAME_SIZE],
+    int frequency,
+    size_t channels,
+    uint32_t rate) {
+  return 0;
+}
+
 // Null object version of RtpData.
 class NullRtpData : public RtpData {
  public:
-  virtual ~NullRtpData() {}
+  ~NullRtpData() override {}
 
   int32_t OnReceivedPayloadData(const uint8_t* payload_data,
                                 size_t payload_size,
-                                const WebRtcRTPHeader* rtp_header) override {
-    return 0;
-  }
+                                const WebRtcRTPHeader* rtp_header) override;
 };
 
+inline int32_t NullRtpData::OnReceivedPayloadData(
+    const uint8_t* payload_data,
+    size_t payload_size,
+    const WebRtcRTPHeader* rtp_header) {
+  return 0;
+}
+
 // Statistics about packet loss for a single directional connection. All values
 // are totals since the connection initiated.
 struct RtpPacketLossStats {