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A previous CL used GlobalSize as the explicit size of clipboard data, removing
trailing nulls. This was a fix to open-ended copying logic that would
occasionally read past the end of the buffer for clipboard entries not
containing terminating nulls. It turns out that some clipboard entries
contain much less data than the entire buffer, and don't pad out to the
end with terminating nulls (only seen on Win7 when copying from command line or
other console apps). The fix is to copy until first null or end of the
buffer.

BUG=821609

Change-Id: Id0e733ccf10b0f7d2f7ec401a584d7f14d4fd063
Reviewed-on: https://chromium-review.googlesource.com/964722Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543487}