Fix -Wunused-function warnings in ASAN builds.

src/client/linux/handler/exception_handler_unittest.cc

Index: src/client/linux/handler/exception_handler_unittest.cc
diff --git a/src/client/linux/handler/exception_handler_unittest.cc b/src/client/linux/handler/exception_handler_unittest.cc
index b4065b414f884eafc11792842d6f4e69169bddea..439b3c38367fb30a47b8bde44cc34a66291be075 100644
--- a/src/client/linux/handler/exception_handler_unittest.cc
+++ b/src/client/linux/handler/exception_handler_unittest.cc
@@ -262,8 +262,6 @@ TEST(ExceptionHandlerTest, ChildCrashWithFD) {
   ASSERT_NO_FATAL_FAILURE(ChildCrash(true));
 }
 
-#endif  // !ADDRESS_SANITIZER
-
 static bool DoneCallbackReturnFalse(const MinidumpDescriptor& descriptor,
                                     void* context,
                                     bool succeeded) {
@@ -305,8 +303,6 @@ static bool InstallRaiseSIGKILL() {
   return sigaction(SIGSEGV, &sa, NULL) != -1;
 }
 
-#ifndef ADDRESS_SANITIZER
-
 static void CrashWithCallbacks(ExceptionHandler::FilterCallback filter,
                                ExceptionHandler::MinidumpCallback done,
                                string path) {
@@ -878,6 +874,8 @@ TEST(ExceptionHandlerTest, ModuleInfo) {
   unlink(minidump_desc.path());
 }
 
+#ifndef ADDRESS_SANITIZER
+
 static const unsigned kControlMsgSize =
     CMSG_SPACE(sizeof(int)) + CMSG_SPACE(sizeof(struct ucred));
 
@@ -930,8 +928,6 @@ CrashHandler(const void* crash_context, size_t crash_context_size,
   return true;
 }
 
-#ifndef ADDRESS_SANITIZER
-
 TEST(ExceptionHandlerTest, ExternalDumper) {
   int fds[2];
   ASSERT_NE(socketpair(AF_UNIX, SOCK_DGRAM, 0, fds), -1);