App Version:  59.0.3071.30
iOS Version:  10.2.1
Device: iPad only
URL:  https://m.youtube.com/

Steps to reproduce:
1. Fresh Install chrome and launch chrome application.
2. Load the web url “https://m.youtube.com/” in portrait orientation. 
3. Tap on any video link and set the video to fullscreen mode.
4. Change the orientation of the video to landscape.
5. Notice that the video is not auto scaling all over the available area in landscape.

Observed results: 
Notice that the video is not auto scaling all over the available area in landscape.

Expected results:  
In landscape, youtube video should display in fullscreen.

Number of times you were able to reproduce: 5/5
Bug reproducible after clean install: Yes
Bug reproducible after clearing cache and cookies: Yes
Bug reproducible on Chrome Mobile on Android: No
Bug reproducible on Safari/Firefox: Firefox: No, Safari: No
Bug reproducible on current stable build (App Version, iOS Version):  No on M58
Bug reproducible on the current beta channel build (App Version, iOS Version):  Yes on M59

Link to video/image: 
M59 beta behavior: https://drive.google.com/a/google.com/file/d/0B8Cek8RsDbF8US1JUDh2SlU3UDA/view?usp=sharing
M58 stable behavior:
https://drive.google.com/a/google.com/file/d/0B8Cek8RsDbF8Y2ZqZlhiQXo1cUU/view?usp=sharing