Readability improvement in apply_issue.
Readability improvement in apply_issue.

R=pgervais@chromium.org
BUG=537417

Review URL: https://codereview.chromium.org/1372133004

git-svn-id: fd409f4bdeea2bb50a5d34bb4d4bfc2046a5a3dd@297015 0039d316-1c4b-4281-b951-d872f2087c98

primiano/depot_tools,duongbaoduy/gtools,duanwujie/depot_tools,duanwujie/depot_tools,disigma/depot_tools,hsharsha/depot_tools,aleonliao/depot_tools,azureplus/chromium_depot_tools,hsharsha/depot_tools,Midrya/chromium,disigma/depot_tools,duanwujie/depot_tools,Midrya/chromium,aleonliao/depot_tools,azureplus/chromium_depot_tools,Midrya/chromium,disigma/depot_tools,hsharsha/depot_tools,CoherentLabs/depot_tools,primiano/depot_tools,duongbaoduy/gtools,CoherentLabs/depot_tools,primiano/depot_tools,aleonliao/depot_tools,duongbaoduy/gtools,azureplus/chromium_depot_tools