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Memory signal is currently unreliable. We should not pause or resume
background tab opening based on the memory pressure signal.

Bug: 762775,730098
Change-Id: Ic976493bb7af94c451d54e8c8f655dbdd6b2421e
Reviewed-on: https://chromium-review.googlesource.com/736869Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Commit-Queue: Zhen Wang <zhenw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512863}