The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/42a9f2f3a5181c7cf46f1028c605625c45b4b8e2

commit 42a9f2f3a5181c7cf46f1028c605625c45b4b8e2
Author: ichikawa <ichikawa@chromium.org>
Date: Wed Mar 22 23:18:16 2017

Delete deprecated -[CWVWebView view].

BUG= 703981 

Review-Url: https://codereview.chromium.org/2762983004
Cr-Commit-Position: refs/heads/master@{#458923}

[modify] https://crrev.com/42a9f2f3a5181c7cf46f1028c605625c45b4b8e2/ios/web_view/internal/cwv_web_view.mm
[modify] https://crrev.com/42a9f2f3a5181c7cf46f1028c605625c45b4b8e2/ios/web_view/public/cwv_web_view.h

ichikawa@ Where in chrome app was this Delete button deprecated from?

This is a method in //ios/web_view (!= //ios/web), which is a library for non-Chrome apps to embed Chrome's web view. It is not used in Chrome app, so it doesn't affect Chrome app.