another big problem, just see it..TOO: each flashed autosave PDF in download folder
2/ I select request folder to save, Chrome not respect my choice for PDF.

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Unable to reproduce the issue on win10 chrome version 56.0.2924.28 with the given steps - Observed that the pdf is downloaded as shown in the screencast

Could you please try the same with a new profile (no apps/extensions) and update the thread. You can create a new profile from chrome://settings

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reproduce after choice: always open with system viewer. (but it's with chrome 55)
must check another time with lastest beta, because see in the beta: new option to always open PDF with default system PDF viewer (option is autoenable when disable ChromePDFViewer and restart Chrome: see  Issue 673920 )

Unable to reproduce the issue on Win-10 using chrome reported version #56.0.2924.28 and latest stable #55.0.2883.87.

Attached screen casts for reference.

Following are the steps followed to reproduce the issue.
------------
1. Disabled Chrome PDF viewer.
2. Restarted chrome.
3. Dragged n dropped pdf file in new tab.
4. Did not observe any flashing tab with both latest beta #56.0.2924.28 and latest stable #55.0.2883.87

baudav@ - Could you please check this issue on latest canary #57.0.2963.0 by creating a new profile without any apps and extensions and please let us know if the issue still persist or not.

Thanks...!!

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New big regression on canary Version 57.0.2964.0 (Build officiel) canary (64 bits)
Can't disable plugins; can't test.

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Thank you for providing more feedback. Adding requester "tkonchada@chromium.org" for another review and adding "Needs-Review" label for tracking.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

baudav@ - This is an intended behavior. The plugins can now be enabled and disabled in the latest canary #57.0.2970.0 by navigating to chrome://settings/content. 

The chrome pdf viewer can be enabled and disabled by following below steps:
------------
1. Navigate to chrome://settings/content.
2. Scroll down till "pdf documents section".
3. Enabling the checkbox at "open pdf files in the default pdf viewer application", will make the chrome pdf viewer disabled at chrome://plugins and vice-versa.

Attaching screen cast for reference.

baudav@ - Could you please check this issue on latest canary #57.0.2970.0 by creating a new profile without any apps and extensions and please let us know if the issue still persist or not.

Thanks...!!

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same problem.. yes difficult to found this option in canary, setting are displayed in tablette mode in standard screen!

1-set to request before save 'Ask where to save each file before downloading'
2-set to use different application for PDF
3-open PDF

Pb1: Chrome save in default downloads folder WITHOUT REQUEST 
Pb2: if PDF is associated to open with Chrome, this downloaded file is open with Chrome, saved again without request and name is name(1).pdf and open another time with chrome, and saved to name(1)(1).pdf...... good loop filling the disk

Thank you for providing more feedback. Adding requester "krajshree@chromium.org" for another review and adding "Needs-Review" label for tracking.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

As per comment #9 marking it as Untriaged to get more inputs from dev team.

Thanks,

This looks similar to  Issue 334474 

yes it's duplicate