DevTools: [CodeMirror] roll CodeMirror to @e0b0e32ed

This patch rolls CodeMirror to @e0b0e32ed. This time we do not patch
CodeMirror to bring support for the long lines: instead, we rely on its
core functionality as it was recently improved. Experiments proved it
to be decent.

TBR=vsevik, pfeldman
BUG=

Review URL: https://chromiumcodereview.appspot.com/23496039

git-svn-id: svn://svn.chromium.org/blink/trunk@157456 bbb929c8-8fbe-4397-9dbb-9b2b20218538