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Context:
The isWebContentsActive() method used for testing purpose, but it's
always set to true in tests, so this CL removes the method. Going
forwards, if there's a need to create "inactive" WebContents in tests,
we should fabricate an inactive WebContents instead.

Bug: 1128658
Change-Id: Idc22ee0471c960781554418ce2035fa25b7c4695
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500569Reviewed-by: Sahel Sharify <sahel@chromium.org>
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821809}