Remove MOJO_SHELL_CLIENT define.

chrome/test/base/browser_tests_main.cc

Index: chrome/test/base/browser_tests_main.cc
diff --git a/chrome/test/base/browser_tests_main.cc b/chrome/test/base/browser_tests_main.cc
index cd12f3bba01b023d1624823ef7418d9221ec896c..614091d3ad9e4ef7cd7f5b9ceac10eb6d6c4e318 100644
--- a/chrome/test/base/browser_tests_main.cc
+++ b/chrome/test/base/browser_tests_main.cc
@@ -8,12 +8,12 @@
 #include "chrome/test/base/chrome_test_launcher.h"
 #include "chrome/test/base/chrome_test_suite.h"
 
-#if defined(MOJO_SHELL_CLIENT)
+#if defined(USE_AURA)
 #include "chrome/test/base/mash_browser_tests_main.h"
 #endif
 
 int main(int argc, char** argv) {
-#if defined(MOJO_SHELL_CLIENT)
+#if defined(USE_AURA)
   int exit_code = 0;
   if (RunMashBrowserTests(argc, argv, &exit_code))
     return exit_code;