restore LOG_FATAL crash key on windows

base/logging.cc

Index: base/logging.cc
diff --git a/base/logging.cc b/base/logging.cc
index 0771b47c182e5c18c868f1124a0784bf411d74a9..a14157a190bd277a924a3f777e3ca8845e4b0e5b 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -126,6 +126,8 @@ LogAssertHandlerFunction log_assert_handler = nullptr;
 // A log message handler that gets notified of every log message we process.
 LogMessageHandlerFunction log_message_handler = nullptr;
 
+CrashMessageHandlerFunction crash_message_handler = nullptr;
+
 // Helper functions to wrap platform differences.
 
 int32_t CurrentProcessId() {
@@ -451,6 +453,10 @@ LogMessageHandlerFunction GetLogMessageHandler() {
   return log_message_handler;
 }
 
+void SetCrashMessageHandler(CrashMessageHandlerFunction handler) {
+  crash_message_handler = handler;
+}
+
 // Explicit instantiations for commonly used comparisons.
 template std::string* MakeCheckOpString<int, int>(
     const int&, const int&, const char* names);
@@ -537,6 +543,9 @@ LogMessage::~LogMessage() {
   stream_ << std::endl;
   std::string str_newline(stream_.str());
 
+  if (severity_ == LOG_FATAL && crash_message_handler)
+    crash_message_handler(str_newline.c_str() + message_start_);
+
   // Give any log message handler first dibs on the message.
   if (log_message_handler &&
       log_message_handler(severity_, file_, line_,