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This patch restricts IndexedDBContextImpl usages to StoragePartitionImpl
and indexeddb itself.  This is one of the final pieces before
the StoragePartitionImpl bit can be removed and IndexedDBControl is used
by StoragePartitionImpl instead of IndexedDBContext.

Bug: 1015214
Change-Id: Ia96becbba462716e001633cc526afa55dd6af7cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2092182
Commit-Queue: enne <enne@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748915}