[Autofill] Support filling <textarea> elements with street address.

* Identify textareas as requesting the full street address, not just line 1.
* Fill textareas with multi-line text, rather than flattened text.  Don't regress label display while doing so.

BUG=314977
TEST=unit_tests
R=estade@chromium.org

Review URL: https://codereview.chromium.org/66033010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235957 0039d316-1c4b-4281-b951-d872f2087c98
Do not issue preflight for crossorigin media resource loads.

Turn off preflighting when issuing requests that are CORS enabled
fetches. The requests do not have any author headers, hence should go
ahead without a preflighting step. CORS-enabled servers sometimes
depend on this.

R=jochen
BUG=173727

Review URL: https://codereview.chromium.org/69813010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235958 0039d316-1c4b-4281-b951-d872f2087c98
Remove 'Learn more' links except for 'Advanced' panel

BUG=319113
TEST=manual

Review URL: https://codereview.chromium.org/70093005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235959 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235959