Chrome Version: 73.0.3675.0 (Developer build)
OS: Chrome OS (testing with Chrome OS on Linux)

Does not reproduce on Linux.

What steps will reproduce the problem?
(1) Run chrome with --enable-features=WebUIPolymer2
(2) Open a PDF or Print Preview

What is the expected result?
No console errors

What happens instead?
Several console errors about trying to read various annotation-related properties of an undefined value: 
[258957:258957:0118/204428.246490:ERROR:CONSOLE(11)] "Uncaught TypeError: Cannot read property 'annotationColorBlack' of undefined", source: chrome://resources/polymer/v1_0/polymer/polymer-extracted.js (11)
[258957:258957:0118/204428.246526:ERROR:CONSOLE(11)] "Uncaught TypeError: Cannot read property 'annotationSize1' of undefined", source: chrome://resources/polymer/v1_0/polymer/polymer-extracted.js (11)
[258957:258957:0118/204428.247258:ERROR:CONSOLE(11)] "Uncaught TypeError: Cannot read property 'annotationColorBlack' of undefined", source: chrome://resources/polymer/v1_0/polymer/polymer-extracted.js (11)
[258957:258957:0118/204428.247355:ERROR:CONSOLE(11)] "Uncaught TypeError: Cannot read property 'annotationSize1' of undefined", source: chrome://resources/polymer/v1_0/polymer/polymer-extracted.js (11)