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Implement ToValue() for SystemMetrics, SystemMemoryInfoKB, DiskInfo, and SwapInfo. These are used to serialize the data inside these structs.

BUG=236763

Review URL: https://chromiumcodereview.appspot.com/23155002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221696 0039d316-1c4b-4281-b951-d872f2087c98