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This CL allows creation of MimeHandlerViewGuest even when element size is
0x0. This is specifically important for Google slides pages where an
<embed> of size 0 is used for print previewing the page. Essentially,
we need to makes sure for such <embed>'s the guest is created (after
attaching) and embed.postMessage works fine.

Bug : 763812

Change-Id: I7ad0cd0898aee2e1b5d6b15dd9bfdcb100a8e16b
Reviewed-on: https://chromium-review.googlesource.com/667900
Commit-Queue: Ehsan Karamad <ekaramad@chromium.org>
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502847}