restore LOG_FATAL crash key on windows

base/logging.h

Index: base/logging.h
diff --git a/base/logging.h b/base/logging.h
index 714545c02bb06ac7f1b31e8a007b671e6dc11d6d..7f87de364a26de04a03c6b0f4bc1a6e571f8341a 100644
--- a/base/logging.h
+++ b/base/logging.h
@@ -288,6 +288,11 @@ typedef bool (*LogMessageHandlerFunction)(int severity,
 BASE_EXPORT void SetLogMessageHandler(LogMessageHandlerFunction handler);
 BASE_EXPORT LogMessageHandlerFunction GetLogMessageHandler();
 
+// Sets the Crash Message Handler that gets passed a fatal log message before
+// the process crashes.
+typedef void (*CrashMessageHandlerFunction)(const std::string& message);
+BASE_EXPORT void SetCrashMessageHandler(CrashMessageHandlerFunction handler);
+
 typedef int LogSeverity;
 const LogSeverity LOG_VERBOSE = -1;  // This is level 1 verbosity
 // Note: the log severities are used to index into the array of names,