Linux: fix an incorrect cast and missing dereference that prevented GNOME 3...

Linux: fix an incorrect cast and missing dereference that prevented GNOME 3 proxy settings from being queried.
This should be merged into both beta and stable.
BUG=91744
Review URL: http://codereview.chromium.org/7621026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97020 0039d316-1c4b-4281-b951-d872f2087c98

net/proxy/proxy_config_service_linux.cc

@@ -557,7 +557,7 @@ GSettings* (*g_settings_new)(const gchar* schema);
   bool SchemaExists(const char* schema_name) {
     const gchar* const* schemas = g_settings_list_schemas();
     while (*schemas) {
-      if (strcmp(schema_name, reinterpret_cast<const char*>(schemas)) == 0)
+      if (strcmp(schema_name, static_cast<const char*>(*schemas)) == 0)
         return true;
       schemas++;
     }