Replace ASSERT by RTC_DCHECK in all non-test code.

webrtc/base/macutils.cc

Index: webrtc/base/macutils.cc
diff --git a/webrtc/base/macutils.cc b/webrtc/base/macutils.cc
index c28ac69b4e68aa8dfedea413a9c36e48b6c701be..794f451dcd2c1408a95166e379cedbd3ee75bb27 100644
--- a/webrtc/base/macutils.cc
+++ b/webrtc/base/macutils.cc
@@ -73,7 +73,7 @@ void DecodeFourChar(UInt32 fc, std::string* out) {
 }
 
 static bool GetOSVersion(int* major, int* minor, int* bugfix) {
-  ASSERT(major && minor && bugfix);
+  RTC_DCHECK(major && minor && bugfix);
   struct utsname uname_info;
   if (uname(&uname_info) != 0)
     return false;