Revert of Set the maximum lines number to 32 for Javascript alert message on Mac port. (https://codereview.chromium.org/140323005/)

Reason for revert:
Avi is absolutely right, reverting.

Original issue's description:
> Set the maximum lines number to 32 for Javascript alert message on Mac port.
> 
> BUG=331219
> R=jeremy@chromium.org
> TEST=Manual test please: Launch chrome and load the popup-bug.html in BUG331219
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=246457

TBR=avi@chromium.org,yi.shen@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=331219

Review URL: https://codereview.chromium.org/145023010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246501 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246501