[DevTools] NetworkPanel: fallback view doesn't respect line breaks.

Fallback resource view wraps long lines, but doesn't respect line breaks
and whitespaces.

So, even if resource is formatted, it will turn to mess.

BUG=

Review URL: https://chromiumcodereview.appspot.com/23809014

git-svn-id: svn://svn.chromium.org/blink/trunk@157685 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Declare extensionServer for generated devtools_extension_api.js

BUG=289034

Review URL: https://chromiumcodereview.appspot.com/23883012

git-svn-id: svn://svn.chromium.org/blink/trunk@157686 bbb929c8-8fbe-4397-9dbb-9b2b20218538