Clean up includes in Style*Image.cpp

Get rid of includes of LayoutObject.h and StyleResolver.h, replacing
them with something more appropriate (layering-wise for the former.)

Change-Id: I759c371d557d008bdb385fc3bdcfa440bff33c9d
Reviewed-on: https://chromium-review.googlesource.com/852493
Reviewed-by: Daniel Bratell <bratell@opera.com>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#527374}
3 files changed