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activity_log.js will be split into activity_log_history.js and
activity_log.js to separate the file in preparation for the real-time
stream implementation.

activity_log.js takes care of the UI lifecycle and common UI elements
logic (i.e. back/clear button, search bar, and loading the activity log
when the page is reached)

activity_log_history.js takes care of fetching, handling and displaying
activity log data from the activityLogPrivate API.

In a later CL, the activity log stream (implemented by listening to
activityLogPrivate.onExtensionActivity events) will be in a different
tab under activity_log.js and will have its own file. This CL aims to
prevent putting all activity logic into one large (and very bloated)
file.

Bug: 832354
Change-Id: I88be6309ba4c4d73e0078ce86e893dafb26594c2
Reviewed-on: https://chromium-review.googlesource.com/c/1432939
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629848}