GitLab

This CL disables implicit keyword accepting completely. The user can only
accept a keyword by pressing Tab or space explicitly while the keyword hint
UI is visible.

BUG=60972
TEST=interactive_ui_tests --gtest_filter=AutocompleteEditViewTest.AcceptKeywordBySpace

Review URL: http://codereview.chromium.org/6252003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72003 0039d316-1c4b-4281-b951-d872f2087c98