Enable logging for Mac by default on debug builds.

webrtc/base/logging.cc

Index: webrtc/base/logging.cc
diff --git a/webrtc/base/logging.cc b/webrtc/base/logging.cc
index 07cc380fbcfbcf8051d1926126750e61d30b6069..ca19d55deab41582538eab70101f5abe133ad4c2 100644
--- a/webrtc/base/logging.cc
+++ b/webrtc/base/logging.cc
@@ -347,7 +347,7 @@ void LogMessage::OutputToDebug(const std::string& str,
                                LoggingSeverity severity,
                                const std::string& tag) {
   bool log_to_stderr = log_to_stderr_;
-#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS) && (!defined(DEBUG) || defined(NDEBUG))
+#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS) && !defined(_DEBUG)

[Taylor Brandstetter, 2015/09/23 18:08:34]

I removed the "NDEBUG" check because NDEBUG controls whether asserts are
enabled, and that's not relevant here.

[pthatcher1, 2015/09/23 18:12:11]

But are any applications going to set NDEBUG and now be surprised when they get
different logging behavior?

   // On the Mac, all stderr output goes to the Console log and causes clutter.
   // So in opt builds, don't log to stderr unless the user specifically sets
   // a preference to do so.