Avoid printing three stack traces on CHECK failure. Print just one.

base/test/test_suite.cc

Index: base/test/test_suite.cc
diff --git a/base/test/test_suite.cc b/base/test/test_suite.cc
index 5154c0578587a7661b3d383a7ffabfaf38b47d31..40d81a6841ac5903e28e03881ad959fbe1918fca 100644
--- a/base/test/test_suite.cc
+++ b/base/test/test_suite.cc
@@ -239,7 +239,10 @@ void TestSuite::UnitTestAssertHandler(const std::string& str) {
     fflush(stderr);
   }
 #endif  // defined(OS_ANDROID)
-  RAW_LOG(FATAL, str.c_str());
+
+  // The logging system actually prints the message before calling the assert
+  // handler. Just exit now to avoid printing too many stack traces.
+  _exit(1);
 }
 
 void TestSuite::SuppressErrorDialogs() {