Bug 392845. Remove xml-rpc extension from browser defaults. r=bsmedberg

browser/confvars.sh

@@ -47,5 +47,5 @@ MOZ_MORKREADER=1
 MOZ_SAFE_BROWSING=1
 MOZ_APP_VERSION=$FIREFOX_VERSION
 MOZ_NO_XPCOM_OBSOLETE=1
-MOZ_EXTENSIONS_DEFAULT=" xml-rpc inspector gnomevfs reporter"
+MOZ_EXTENSIONS_DEFAULT=" inspector gnomevfs reporter"
 # MOZ_APP_DISPLAYNAME will be set by branding/configure.sh