131762 - can open multiple occurrences of download manager.

also adds a pref in Navigator > Downloads to set the behavior when starting a download (open DM, open progress dialog, open nothing). r=hewitt sr=ben a=asa

suite/locales/en-US/chrome/common/pref/pref-download.dtd

@@ -2,7 +2,7 @@
 <!ENTITY downloadBehavior.label "When starting a download">
 <!ENTITY openDM.label "Open the download manager">
 <!ENTITY openDM.accesskey "m">
-<!ENTITY openProgressDialog.label "Open a progress dialog">
+<!ENTITY openProgressDialog.label "Open a progress window">
 <!ENTITY openProgressDialog.accesskey "p">
 <!ENTITY doNothing.label "Don't open anything">
 <!ENTITY doNothing.accesskey "D">

suite/locales/en-US/chrome/common/pref/preftree.dtd

@@ -29,6 +29,7 @@
 <!ENTITY debug.label  "Debug">
 <!ENTITY debug1.label "Events">
 <!ENTITY debug2.label "Networking">
+<!ENTITY download.label "Downloads">
 <!ENTITY search.label "Internet Search">
 <!ENTITY policies.label "Security Policies">
 <!ENTITY mousewheel.label "Mouse Wheel">