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This change makes IndexedDBFactory a virtual base class, and what was
IndexedDBFactory is now IndexedDBFactoryImpl. This change will allow tests
to create proper mock factories and not require them to instantiate the
"real" factory (which often doesn't work) in the test. It will also take us
one step closer to eliminating special cases in IDB's other classes where
having a factory is optional (because tests don't create them).

BUG=393974
R=ericu@chromium.org, jochen@chromium.org, jsbell@chromium.org, michaeln@chromium.org

Review URL: https://codereview.chromium.org/313883003

Patch from cmumford@chromium.org <cmumford@chromium.org>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284161 0039d316-1c4b-4281-b951-d872f2087c98