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browser_process_impl.h contains declarations for CreateStatusTrayManager(),
CreateSafeBrowsingDetectionService() and CreateViewedPageTracker() methods,
whose implementations have since been removed. This CL removes these unused
declarations and add check for private field created_notification_ui_manager_.

Bug:

Change-Id: If9337bae7a5fc20a5fcc1a98c42e53e803102660
Reviewed-on: https://chromium-review.googlesource.com/892685
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533334}