Move ProgID methods from BrowserDistribution into install_static.

chrome/install_static/chromium_install_modes.cc

Index: chrome/install_static/chromium_install_modes.cc
diff --git a/chrome/install_static/chromium_install_modes.cc b/chrome/install_static/chromium_install_modes.cc
index 997aa4b6a9924bc37b1cbb49c8b023c5ee700300..21e1d6fd769392258fd6a84859c7e82447a5a74a 100644
--- a/chrome/install_static/chromium_install_modes.cc
+++ b/chrome/install_static/chromium_install_modes.cc
@@ -33,6 +33,8 @@ const InstallConstants kInstallModes[] = {
         L"",  // No logo suffix for the primary install mode.
         L"",  // Empty app_guid since no integraion with Google Update.
         L"Chromium",  // A distinct base_app_id.
+        L"ChromiumHTM",  // ProgID prefix.
+        L"Chromium HTML Document",  // ProgID description.
         L"",  // Empty default channel name as above.
         ChannelStrategy::UNSUPPORTED,
         true,  // Supports system-level installs.