@scottchen: Do you have any test PDF document that triggers this dialog?

Fix at https://chromium-review.googlesource.com/c/chromium/src/+/1105401. Attaching screenshot.

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8bee0ec84a9a59a6e4821304e8f7edb2a9bb9034

commit 8bee0ec84a9a59a6e4821304e8f7edb2a9bb9034
Author: dpapad <dpapad@chromium.org>
Date: Tue Jun 19 01:25:20 2018

WebUI MD Refresh: Update PDF password dialog buttons.

Bug:  853958 
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I1a9848f3bb1cba427e229b387516ffa1764c1096
Reviewed-on: https://chromium-review.googlesource.com/1105401
Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568280}
[modify] https://crrev.com/8bee0ec84a9a59a6e4821304e8f7edb2a9bb9034/chrome/browser/resources/pdf/elements/viewer-password-screen/viewer-password-screen.html

Able to reproduce this issue on build without fix(69.0.3452.0), hence verifying the fix on latest canary 69.0.3465.0 on windows and Linux. 

NOTE: Unable to verify fix on Mac due to due to Issue 854114.

Now observing submit button as showed in comment#4. Attaching screenshot for reference.

Hence fix is working as expected in Linux and Windows. Not adding Verified labels as we can't verify on Mac due to blocking issue 854114.

Thanks!

Able to reproduce this issue on build without fix(69.0.3452.0), hence verifying the fix on latest canary 69.0.3466.0 on Mac.

Now observing submit button as showed in comment#4. Attaching screenshot for reference.

Adding Verified labels as this working as expected.

Thanks!

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