Minor comment and style updates for on-demand update check code.

chrome/browser/google/google_update_win.cc

Index: chrome/browser/google/google_update_win.cc
diff --git a/chrome/browser/google/google_update_win.cc b/chrome/browser/google/google_update_win.cc
index a913c02fc63ac986afe6e5dbe47e705e95dfb37a..78630f1a810f345163011a78b14e967c346cfb59 100644
--- a/chrome/browser/google/google_update_win.cc
+++ b/chrome/browser/google/google_update_win.cc
@@ -139,12 +139,12 @@ HRESULT CreateGoogleUpdate3WebClass(
     return google_update->CreateInstance(CLSID_GoogleUpdate3WebUserClass);
 
   // For a system-level install, update checks can be done by a normal user with
-  // the ServiceClass.
+  // the MachineClass.
   if (!install_update_if_possible)
     return google_update->CreateInstance(CLSID_GoogleUpdate3WebMachineClass);
 
   // For a system-level install, an update requires Admin privileges for writing
-  // to %ProgramFiles%. Elevate while instantiating the ServiceClass.
+  // to %ProgramFiles%. Elevate while instantiating the MachineClass.
   return CoCreateInstanceAsAdmin(CLSID_GoogleUpdate3WebMachineClass,
                                  IID_IGoogleUpdate3Web, elevation_window,
                                  google_update->ReceiveVoid());