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This adds a full credential selection whenever a username element is clicked. Previously, if a username element was filled by either the user or the password manager, the user would have to erase the entire field to see the full list of credentials the user has. Now the user can click on the field at any point to get a full list of accounts. However, if the user starts typing again, then inline autocomplete takes over.

BUG=341474

Review URL: https://codereview.chromium.org/166043006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283383 0039d316-1c4b-4281-b951-d872f2087c98