PlaceHolder in TextArea should allow carriage return and line feed

As per current spec, placeholder should allow carriage return and line feed for text area. While placeholder should strip carriage return and line feed for input type=text.

BUG=367632
R=tkent, keishi1
TEST=Placeholder containing CR and LF are not stripped from the text for
type text area, while for input type text it is stripped.

Review URL: https://codereview.chromium.org/253853002

git-svn-id: svn://svn.chromium.org/blink/trunk@173455 bbb929c8-8fbe-4397-9dbb-9b2b20218538