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The include of the image_provider.h is not necessary, instead a forward
declaration is enough. This CL does that. It should not introduce any
behavior change.

Bug: None
Change-Id: Iccc485099e6d2e7789329d746048f9dfc88b2787
Reviewed-on: https://chromium-review.googlesource.com/c/1430584Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625762}