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It was introduced to resume other pages in the same render process
when the page paused on breakpoint is closed.

This now works due to Mojo connection error handler triggering
detach automatically and unpausing as a result.

Removing content-specific code from DevToolsAgent unblocks
migrating it to blink.

Bug: 776009
Change-Id: I20113df99a947eeaeabfb59886a07fc3f866ea27
Reviewed-on: https://chromium-review.googlesource.com/830977Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524541}