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Cleanup in web_app_shortcut_win.cc

This change makes the following cleanup changes:
* replace NULL with nullptr
* remove namespace specifier for web_app::internals when inside that
  namespace
* replace for loops with range-based for loops
* add braces around a multi-line conditional statement

Change-Id: I93876e058cf95882b0faa1e4dc8dece891975a5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576501Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Chase Phillips <cmp@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#835276}