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To replace ChromeLoadParams,  WebLoadParams and OpenNewTabCommand as parameters passed in to LoadUrlInCurrentTab, SwitchToTab and OpenUrlInNewTab in url loading service.

Bug: 907527
Change-Id: I911985c7f62bd9d807c71e5349f194cefd1d57a0
Reviewed-on: https://chromium-review.googlesource.com/c/1488925
Commit-Queue: David Jean <djean@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636759}