[rb] Fully support Chrome 120+ old headless mode (#13271)

When Chrome's new headless mode was announced, it was mentioned that
they intended to remove the old headless mode from the Chrome binary.
Some people still want to use the old headless mode, as it's more
lightweight, performant, and has fewer dependencies - at the expense of
having fewer features.

Chrome 120+ has a standalone `chrome-headless-shell` binary to keep the
old headless mode working for those who wish to use it. If your Ruby
code sets up the Chrome driver with `--headless` (which currently
defaults to `old`) or `--headless=old` explicitly, you will lose
capabilities such as setting permissions, fetching the logs and using
the CDP API.

That happens because the new binary has a browser name of
`chrome-headless-shell`, instead of `chrome`. That makes it be
recognized as something other than Chrome, not setting its capabilities.

This commit introduces `chrome-headless-shell` as an alternative Chrome
browser name, fixing this issue.

Fixes #13112

rb/lib/selenium/webdriver/common/driver.rb

@@ -43,7 +43,7 @@ class << self
 
         def for(browser, opts = {})
           case browser
-          when :chrome
+          when :chrome, :chrome_headless_shell
             Chrome::Driver.new(**opts)
           when :internet_explorer, :ie
             IE::Driver.new(**opts)
@@ -329,7 +329,7 @@ def screenshot
 
       def add_extensions(browser)
         extensions = case browser
-                     when :chrome, :msedge
+                     when :chrome, :chrome_headless_shell, :msedge
                        Chromium::Driver::EXTENSIONS
                      when :firefox
                        Firefox::Driver::EXTENSIONS

rb/lib/selenium/webdriver/remote/bridge.rb

@@ -60,7 +60,7 @@ def create_session(capabilities)
           @capabilities = Capabilities.json_create(capabilities)
 
           case @capabilities[:browser_name]
-          when 'chrome'
+          when 'chrome', 'chrome-headless-shell'
             extend(WebDriver::Chrome::Features)
           when 'firefox'
             extend(WebDriver::Firefox::Features)
@@ -82,7 +82,7 @@ def session_id
         def browser
           @browser ||= begin
             name = @capabilities.browser_name
-            name ? name.tr(' ', '_').downcase.to_sym : 'unknown'
+            name ? name.tr(' -', '_').downcase.to_sym : 'unknown'
           end
         end