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AppInstallEventLog and SingleAppInstallEventLog classes are used for
storing logs on the disk and prepare for upload. Extract the common
code with ARC++ unspecific code into common classes. This is a
prework for adding similar classes for extension events.

Bug: 1081192
Change-Id: I481e864c89ce34fb9c8ddbd8983ad119be8bdf85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2193675
Commit-Queue: Swapnil Gupta <swapnilgupta@google.com>
Reviewed-by: Oleg Davydov <burunduk@chromium.org>
Reviewed-by: Askar Aitzhan <askaraitzhan@google.com>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775048}