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Before this CL, we called the navigation to prerendered contents "swap".
However, we decided to consistently call it "activate". This CL replaces
existing usage.

Bug: 1132746
Change-Id: I4c45b177ceccda4732023ea529e8aeb3a3b0c16b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494201Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820152}