macOS registers Edge as 'com.microsoft.edgemac' in LaunchServices, which
differs from the CFBundleIdentifier 'com.microsoft.Edge' in the app's own
Info.plist. Without recognising the LaunchServices IDs, Edge users who set
Edge as their default browser are not detected as having a Chromium browser.
Add the four com.microsoft.edgemac* variants to CHROMIUM_BUNDLE_IDS and a
corresponding test that mocks the LaunchServices → osascript resolution
path for Edge.
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