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This is needed so that ProfileImpl ctor can access DOMStorageContext.

The ExtensionInfoMap is needed early, in ProfileIOData::InitializeOnUIThread. Construct it on demand.

BUG=104292

Review URL: https://chromiumcodereview.appspot.com/10830278

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151291 0039d316-1c4b-4281-b951-d872f2087c98