Make taskkill explicitly kill browser_tests and goma compiler proxy
Make taskkill explicitly kill browser_tests and goma compiler proxy

TBR=machenbach

BUG=371318

Review URL: https://codereview.chromium.org/273523009

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@269054 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build