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ArcAppInstallEventLog and SingleArcAppInstallEventLog classes are used
for storing logs on the disk and prepare for upload. Similar classes
are implemented for extension events. ArcAppInstallEventLog::Load
method is refactored to extract the common code into
SingleInstallEventLog class.

Bug: 1081192
Change-Id: I20731598f52d37cc0c890b5254011787f04ff97d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199282Reviewed-by: Oleg Davydov <burunduk@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Swapnil Gupta <swapnilgupta@google.com>
Cr-Commit-Position: refs/heads/master@{#776913}