Revert 239304 "Fix a race on cros where a WebSocketException is ..."

We are seeing failures on the chromium.perf bots.

> Fix a race on cros where a WebSocketException is raised if we navigate too early.
> 
> We see this bug with the perf tests because they navigate right away as they are launched.
> 
> BUG=324916
> TEST=manual
> 
> Review URL: https://codereview.chromium.org/105253002

BUG=327383,327747
TBR=achuith@chromium.org

Review URL: https://codereview.chromium.org/106173005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240148 0039d316-1c4b-4281-b951-d872f2087c98
Convert string16 to base::string16 in chrome/browser

TBR=sky

Review URL: https://codereview.chromium.org/112943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240149 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240148
SVN changes up to revision 240149