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..19a6ba6a7333de5164728f0de83789d4e300767e 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();
 
@@ -1191,10 +1191,9 @@ void Bus::OnDispatchStatusChangedThunk(DBusConnection* connection,
 }
 
 // static
-DBusHandlerResult Bus::OnConnectionDisconnectedFilter(
-    DBusConnection* connection,
-    DBusMessage* message,
-    void* data) {
+DBusHandlerResult Bus::OnConnectionDisconnectedFilter(DBusConnection*,
+                                                      DBusMessage* message,
+                                                      void* /*data*/) {
   if (dbus_message_is_signal(message,
                              DBUS_INTERFACE_LOCAL,
                              kDisconnectedSignal)) {
@@ -1206,7 +1205,7 @@ DBusHandlerResult Bus::OnConnectionDisconnectedFilter(
 
 // static
 DBusHandlerResult Bus::OnServiceOwnerChangedFilter(
-    DBusConnection* connection,
+    DBusConnection* /*connection*/,
     DBusMessage* message,
     void* data) {
   if (dbus_message_is_signal(message,