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To componentize CaptivePortalBlockingPage, we are going to move the
Chrome-specific elements of its creation into
ChromeSecurityBlockingPageFactory. However, that move is currently
hindered by the fact that there are two subclasses of
CaptivePortalBlockingPage that supply the Wifi info for
testing/debugging purposes.

This CL eliminates the need for those custom subclasses by instead
adding a method to CaptivePortalBlockingPage to override the wifi info
for testing. This change will enable the transfer of all //chrome-level
creation sites of CaptivePortalBlockingPage to do so via
ChromeSecurityBlockingPageFactory in a followup CL.

Bug: 1025059
Change-Id: I9b6feaddcb52ee994ecae8dc3ba73c51878d48fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949469
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721926}