Move socket_address.h to webrtc namespace

Bug: webrtc:42232595
Change-Id: I58a5a286887e66fad95c6acf146808623a76dd0d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/380842
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Auto-Submit: Evan Shrubsole <eshr@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#44111}
diff --git a/rtc_base/socket_address_pair.h b/rtc_base/socket_address_pair.h
index aa1b01c..5a3bf81 100644
--- a/rtc_base/socket_address_pair.h
+++ b/rtc_base/socket_address_pair.h
@@ -23,11 +23,10 @@
 class SocketAddressPair {
  public:
   SocketAddressPair() {}
-  SocketAddressPair(const rtc::SocketAddress& srs,
-                    const rtc::SocketAddress& dest);
+  SocketAddressPair(const SocketAddress& srs, const SocketAddress& dest);
 
-  const rtc::SocketAddress& source() const { return src_; }
-  const rtc::SocketAddress& destination() const { return dest_; }
+  const SocketAddress& source() const { return src_; }
+  const SocketAddress& destination() const { return dest_; }
 
   bool operator==(const SocketAddressPair& r) const;
   bool operator<(const SocketAddressPair& r) const;
@@ -35,8 +34,8 @@
   size_t Hash() const;
 
  private:
-  rtc::SocketAddress src_;
-  rtc::SocketAddress dest_;
+  SocketAddress src_;
+  SocketAddress dest_;
 };
 
 }  //  namespace webrtc