DevTools: Sort build file contents

devtools.gyp* contents ordering is highly confusing, and it usually
takes some time to find certain snippets when modifying the deployment setup.

TBR=vsevik

Review URL: https://codereview.chromium.org/458463003

git-svn-id: svn://svn.chromium.org/blink/trunk@179921 bbb929c8-8fbe-4397-9dbb-9b2b20218538