libchrome: Several upstreamable fixes from libchrome

dbus/bus.cc

Index: dbus/bus.cc
diff --git a/dbus/bus.cc b/dbus/bus.cc
index 1827928b9e04308473269d024b56f7db12d30ffa..a57cffbdb453fdd5e59a5f6a090a2e59e64d2126 100644
--- a/dbus/bus.cc
+++ b/dbus/bus.cc
@@ -83,13 +83,13 @@ class Watch : public base::MessagePumpLibevent::Watcher {
 
  private:
   // Implement MessagePumpLibevent::Watcher.
-  void OnFileCanReadWithoutBlocking(int file_descriptor) override {
+  void OnFileCanReadWithoutBlocking(int /* file_descriptor */) override {
     const bool success = dbus_watch_handle(raw_watch_, DBUS_WATCH_READABLE);
     CHECK(success) << "Unable to allocate memory";
   }
 
   // Implement MessagePumpLibevent::Watcher.
-  void OnFileCanWriteWithoutBlocking(int file_descriptor) override {
+  void OnFileCanWriteWithoutBlocking(int /* file_descriptor */) override {
     const bool success = dbus_watch_handle(raw_watch_, DBUS_WATCH_WRITABLE);
     CHECK(success) << "Unable to allocate memory";
   }
@@ -1095,7 +1095,7 @@ void Bus::OnToggleTimeout(DBusTimeout* raw_timeout) {
 }
 
 void Bus::OnDispatchStatusChanged(DBusConnection* connection,
-                                  DBusDispatchStatus status) {
+                                  DBusDispatchStatus /* status */) {
   DCHECK_EQ(connection, connection_);
   AssertOnDBusThread();
 
@@ -1192,9 +1192,9 @@ void Bus::OnDispatchStatusChangedThunk(DBusConnection* connection,
 
 // static
 DBusHandlerResult Bus::OnConnectionDisconnectedFilter(
-    DBusConnection* connection,
+    DBusConnection* /* connection */,
     DBusMessage* message,
-    void* data) {
+    void* /* data */) {
   if (dbus_message_is_signal(message,
                              DBUS_INTERFACE_LOCAL,
                              kDisconnectedSignal)) {
@@ -1206,7 +1206,7 @@ DBusHandlerResult Bus::OnConnectionDisconnectedFilter(
 
 // static
 DBusHandlerResult Bus::OnServiceOwnerChangedFilter(
-    DBusConnection* connection,
+    DBusConnection* /* connection */,
     DBusMessage* message,
     void* data) {
   if (dbus_message_is_signal(message,