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This change writes (flushes) compacted data to disk resulting in
changes, which would previously only be flushed the next db close/open
cycle, to be written immediately.

BUG=329347

Review URL: https://codereview.chromium.org/397323003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284313 0039d316-1c4b-4281-b951-d872f2087c98