Move webrtc/{base => rtc_base}

webrtc/rtc_base/callback.h

Index: webrtc/rtc_base/callback.h
diff --git a/webrtc/base/callback.h b/webrtc/rtc_base/callback.h
similarity index 98%
copy from webrtc/base/callback.h
copy to webrtc/rtc_base/callback.h
index 7ffdcd73735b98c94b678bad227c7691d504b499..4435a18d18c3de0b39788dd60c94d505bcd93824 100644
--- a/webrtc/base/callback.h
+++ b/webrtc/rtc_base/callback.h
@@ -59,8 +59,8 @@
 //   my_callback = Callback1<int, int>();
 //   cout << my_callback.empty() << endl;  // true
 
-#ifndef WEBRTC_BASE_CALLBACK_H_
-#define WEBRTC_BASE_CALLBACK_H_
+#ifndef WEBRTC_RTC_BASE_CALLBACK_H_
+#define WEBRTC_RTC_BASE_CALLBACK_H_
 
 #include "webrtc/base/refcount.h"
 #include "webrtc/base/scoped_ref_ptr.h"
@@ -257,4 +257,4 @@ class Callback5 {
 };
 }  // namespace rtc
 
-#endif  // WEBRTC_BASE_CALLBACK_H_
+#endif  // WEBRTC_RTC_BASE_CALLBACK_H_