Revert of DevTools: move front-end URL handling to DevToolsUIBindingds (patchset #2 id:40001 of https://codereview.chromium.org/2607833002/ )

Reason for revert:
A better fix is coming, reverting this one to make it a part of the new fix so that one CL may be merged onto a branch.

Original issue's description:
> DevTools: move front-end URL handling to DevToolsUIBindingds
>
> BUG=662859
>
> Committed: https://crrev.com/eea3300239f0b53e172a320eb8de59d0bea65f27
> Cr-Commit-Position: refs/heads/master@{#440926}

TBR=dgozman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=662859

Review-Url: https://codereview.chromium.org/2620193002
Cr-Commit-Position: refs/heads/master@{#442758}
10 files changed