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Recent additions created duplicate symbols in content/browser
of the variable g_url_loader_factory_callback_for_test and of
the method BlobStorageContextGetter. BlobStorageContextGetter is
a duplicate method but small enough that it's probably ok.

This renames one BlobStorageContextGetter to
BlobStorageContextGetterForStorage (lacking a suitable place for
sharing the method) and one of the
g_url_loader_factory_callback_for_test variables to
g_create_network_factory_callback_for_test to better describe what it
contains.

These errors don't appear in the jumbo configurations covered by
the bots because the files are far enough apart in file lists
to normally not be grouped with each other.

Change-Id: I17ecc36d2271c71f6b7affcc41ef4935b107743f
Reviewed-on: https://chromium-review.googlesource.com/915367
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536987}