move the choose file/set as current to a global spot so other pref panes can get to them, for #27630, r=sspitzer

suite/common/pref/pref-navigator.js

@@ -1,19 +1,2 @@
-var bundle = srGetStrBundle("chrome://pref/locale/prefutilities.properties");
 
-function prefNavSelectFile()
-{
-  var folderField = document.getElementById("browserStartupHomepage");
-  var url = getFileOrFolderURL( bundle.GetStringFromName("choosehomepage"), false );
-  if( url != -1 )
-    folderField.value = url;
-}
 
-function setHomePageToCurrentPage()
-{
-  if( !parent.opener.appCore )
-    return false;
-  var homePageField = document.getElementById("browserStartupHomepage");
-  var url = parent.opener.content.location.href;
-  if( url )
-    homePageField.value = url;
-}

suite/common/pref/pref-navigator.xul

@@ -79,8 +79,8 @@
   		  </html:div>
         <box orient="horizontal">
   				<spring flex="1"/>
-  				<titledbutton class="dialog push" name="starts" type="button" value="&useCurrent;" onclick="setHomePageToCurrentPage();" />
-  				<titledbutton class="dialog push" name="browse" type="button" value="&browseFile;" onclick="prefNavSelectFile()"/>
+  				<titledbutton class="dialog push" name="starts" type="button" value="&useCurrent;" onclick="setHomePageToCurrentPage('browserStartupHomepage');" />
+  				<titledbutton class="dialog push" name="browse" type="button" value="&browseFile;" onclick="prefNavSelectFile('browserStartupHomepage', 'choosehomepage');"/>
   			</box>		
 			</box>		
 		</titledbox>