Fixes to allow is_multi_dll_chrome=false to work again

This change fixes a linker issue to allow is_multi_dll_chrome set to
false to build successfully.  I also had to change some of the delay
load entries based on this flag to prevent crashes in the sandboxed
processes that now load chrome.dll instead of chrome_child.dll. This
has no change on the default build configuration where this flag is
set to true.

Bug: 726150
Change-Id: Ia1bd322193ef0883ab3d5746874fb4a124ad6f98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1697368
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Chris Davis <chrdavis@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#676566}