cleanup: clang-tidy on ui/views/win/

This change is a small cleanup based on clang-tidy's recommendations
for ui/views/win/.

These include:
* use default member initializer for 'got_mouse_up_', etc.
* use range-based for loop
* add a missing include

Change-Id: I159e8c603313b1129e2ee07e7b67142c56224157
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4313427


Reviewed-by: Elaine Chien <elainechien@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/main@{#1118439}