DevTools: Timeline: do not force lazyTimelineView to be created.

Otherwise it is creating right from the constructor.

BUG=

Review URL: https://codereview.chromium.org/364153002

git-svn-id: svn://svn.chromium.org/blink/trunk@177479 bbb929c8-8fbe-4397-9dbb-9b2b20218538