Chrome Version : 72.0.3626.64 (Official Build) eaa9668e80ce5405e7f1902579558ea725c06ca1-refs/branch-heads/3626@{#708} 32/64 bit
OS : Mac(10.13.6, 10.13.1, 10.14.3), Windows (7,8,10), Linux(14.04 LTS)

Test URL : http://cb.vu/unixtoolbox.pdf

What steps will reproduce the problem?
1. Launch chrome, navigate to above test URL and open print preview window on PDF page.
2. In 'More settings', check 'Fit to page' checkbox, double click inside 'Scale' text field and hit 'Backspace' key to delete the selected text.
3. Now, click outside the text field and observe the 'Fit to page' checkbox.

Actual Result : 'Fit to page' option remains checked even when 'Scale' value is set to default (i.e 100)

Expected Result : 'Fit to page' option should get unchecked when user clear the value from 'Scale' textfield. 

This is a regression issue broken in M-71 and below is the bisect information:
Good Build :71.0.3562.0 (Revision : 594164)
Bad Build :71.0.3563.0 (Revision : 594642)

Chromium bisect URL:

https://chromium.googlesource.com/chromium/src/+log/b3a757e3b45e96cef37eda8bf57fbe081b8ee1aa..46e6ba7b893ab233a01e4c6e844fdf3312560ed7

Suspect: r594208

@rbpotter: Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Note : 
1. Able to reproduce issue in Dev #73.0.3664.3, Stable #71.0.3578.98 and Canary build #73.0.3673.0
2. Unable to perform Per-revision bisect as it shows an traceback error; Tried on other machines but still getting the same error.
3. Hence provided suspect through 'Chromium bisect'.
4. This issue can be reproduced on any PDF page.

Thank you..!
 

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	Expected_Result.mov 10.6 MB View Download