Full path of folders:
C:\Users\nick\AppData\Local\Google\Chrome\User Data\Crashpad\reports
In User Data i have file CrashpadMetrics-active.pma
In Crashpad i have 2 files metadata and settings.dat
Other folders is empty.
I use Version 56.0.2924.87 x64 for Windows.
I fully clear my old non-portable chrome before installing portable version.
After i close portable chrome these folders disappears.
I also have changed 2 lines in GoogleChromePortable.ini:
Make DisableSplashScreen=true and CacheInTemp=false, other settings is set by default.
And also, if i open .pdf or .html etc file - it's open not portable chrome, because in "Default Programs" in windows settings set up "Google Chrome", not "Google Chrome portable", so it's open Google Chrome\App\Chrome-bin\chrome.exe which creates AppData\Local\Google\Chrome\User Data folder with cache etc.
If they are removed on exit, it's working as designed.
Sometimes, the impossible can become possible, if you're awesome!
Oh, ok.
And about "Default Programs" above. I solved it by searching in registry by "App\Chrome-bin\chrome.exe" and change everything i found to "Google Chrome\GoogleChromePortable.exe", so now when i open shortcut with http/https/ftp etc link, or click on link in any program - i open GoogleChromePortable.exe, not chrome.exe, and all is fine, no trash folders from chrome.exe is creating.