Replace ASSERT by RTC_DCHECK in all non-test code.

webrtc/base/proxydetect.cc

Index: webrtc/base/proxydetect.cc
diff --git a/webrtc/base/proxydetect.cc b/webrtc/base/proxydetect.cc
index 7f298de790abaabe5ee8c6b3578309acc8a72215..83596b56699e4f5cc93f496d8bb939bbf40d836a 100644
--- a/webrtc/base/proxydetect.cc
+++ b/webrtc/base/proxydetect.cc
@@ -33,6 +33,7 @@
 #include <memory>
 
 #include "webrtc/base/arraysize.h"
+#include "webrtc/base/checks.h"
 #include "webrtc/base/fileutils.h"
 #include "webrtc/base/httpcommon.h"
 #include "webrtc/base/httpcommon-inl.h"
@@ -410,7 +411,7 @@ bool GetFirefoxProfilePath(Pathname* path) {
 }
 
 bool GetDefaultFirefoxProfile(Pathname* profile_path) {
-  ASSERT(NULL != profile_path);
+  RTC_DCHECK(NULL != profile_path);
   Pathname path;
   if (!GetFirefoxProfilePath(&path)) {
     return false;