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During another change/need to iterate over all storage
partitions it was noticed that other places in Chromium
have the same requirement. This change exposts a
GetStoragePartitionCount method off of

having to iterate over the collection of partitions to
achieve the same result. In addition the existing call
site of this method has been updated to call the
BrowserContext version.

content: :BrowserContext in order to avoid other classes
Change-Id: Ie60b726841f6955f7df5128cbe89955ea0e3a98d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057808
Commit-Queue: Brandon Maslen <brandm@microsoft.com>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742810}