Include browser_tests.exe in output of official Chrome Windows builds.

BUG=379986

Review URL: https://codereview.chromium.org/302403003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274538 0039d316-1c4b-4281-b951-d872f2087c98

chrome/tools/build/win/TESTS

-test_shell.exe
-interactive_ui_tests.exe
+browser_tests.exe
+fonts\*
 icudt38.dll
 icudt42.dll
 icudt46.dll
 icudt.dll
 icudtl.dat
+interactive_ui_tests.exe
 plugins\np_test_netscape_plugin.dll
-fonts\*
+test_shell.exe