Move PageConsole to using FrameHost instead of Page

Move PageConsole to using FrameHost instead of Page

This is not a complete move.  PageConsole still needs
to reach through FrameHost to Page to get the mainFrame
to get the main document to pass to the inspector.
But otherwise it only needs chrome() which is accessible
from FrameHost.

BUG=305811
R=abarth@chromium.org, abarth

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=164146

[eseidel, 2013-12-19 06:30:44]

CCing pfeldman in case he'd like to comment on the FIXME.

[abarth-chromium, 2013-12-19 06:31:16]

lgtm

[eseidel, 2013-12-19 06:46:51]

Committed patchset #1 manually as r164146 (presubmit successful).