Enable --high-dpi-support by default. (Note that this is a registry setting. Also, remove dead references to HiDPI flag.). This patch is based on portions of girard's patch here https://codereview.chromium.org/232483005/

BUG=149881, 362245

Review URL: https://codereview.chromium.org/294293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273211 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed