DevTools: [CodeMirror] increase LongLinesMode threshold up to 2000
DevTools: [CodeMirror] increase LongLinesMode threshold up to 2000

This patch improves LongLinesMode threshold up to 2000 as it is
somewhat likely to find a single 1000-chars long line in a regular
source code.

BUG=
TBR=pfeldman

Review URL: https://codereview.chromium.org/18069002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@153138 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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