Fix a methods dec. in MimeHandlerViewContainerBase

The method CreateMimeHandlerViewGuestIfNecessary() has an implementation
in mime_handler_view_container_base.cc. It is marked as abstract by
mistake.

TBR=wjmaclean@chromium.org

Bug: 659750
Change-Id: If4751752f05ff120f47c7d65a5a6c3189aa08ac3
Reviewed-on: https://chromium-review.googlesource.com/1184119
Reviewed-by: Ehsan Karamad <ekaramad@chromium.org>
Commit-Queue: Ehsan Karamad <ekaramad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585007}
1 file changed