First stab at Mac breakpad support.

base/logging.cc

Index: base/logging.cc
diff --git a/base/logging.cc b/base/logging.cc
index 11dfe5db635489372586dd401857a448562a3d8d..41a0933d9933c17a77c9abe323d522b76e4dd744 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -525,8 +525,6 @@ LogMessage::~LogMessage() {
 #endif
         // Crash the process to generate a dump.
         DebugUtil::BreakDebugger();
-        // TODO(mmentovai): when we have breakpad support, generate a breakpad
-        // dump, but until then, do not invoke the Apple crash reporter.
       }
     }
   } else if (severity_ == LOG_ERROR_REPORT) {