[py] Add support for the new MicrosoftEdge (#7459)

Extracting Chromium from Chrome module. Have both Chrome and Edge
inherited from Chromium module. Add is_legacy parameter to launch
the new MicrosoftEdge.

Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/SeleniumHQ/selenium
Cr-Mirrored-Commit: 139ca6cddf95feb4446931c75f2bb7ce9ff83496
diff --git a/setup.py b/setup.py
index 12a3850..85ebdff 100755
--- a/setup.py
+++ b/setup.py
@@ -54,6 +54,7 @@
                  'selenium.common',
                  'selenium.webdriver',
                  'selenium.webdriver.android',
+                 'selenium.webdriver.chromium',
                  'selenium.webdriver.chrome',
                  'selenium.webdriver.common',
                  'selenium.webdriver.common.html5',