Bug 1396869 - eliminate -Wunused-private-field warnings in Android's message pump; r=jld

Android's MessagePumpForUI includes some useless code in its
MessagePumpAndroid class, which is completely unused.  Let's go ahead
and delete that.

ipc/chromium/src/base/message_pump_android.cc

@@ -22,22 +22,12 @@ namespace base {
 
 MessagePumpForUI::MessagePumpForUI()
   : state_(NULL)
-  , pump(*this)
 {
 }
 
 MessagePumpForUI::~MessagePumpForUI() {
 }
 
-MessagePumpAndroid::MessagePumpAndroid(MessagePumpForUI &aPump)
-  : pump(aPump)
-{
-}
-
-MessagePumpAndroid::~MessagePumpAndroid()
-{
-}
-
 void MessagePumpForUI::Run(Delegate* delegate) {
   RunState state;
   state.delegate = delegate;

ipc/chromium/src/base/message_pump_android.h

@@ -12,18 +12,6 @@
 
 namespace base {
 
-class MessagePumpForUI;
-
-class MessagePumpAndroid {
-
- public:
-  MessagePumpAndroid(MessagePumpForUI &pump);
-  ~MessagePumpAndroid();
-
- private:
-  base::MessagePumpForUI &pump;
-};
-
 // This class implements a MessagePump needed for TYPE_UI MessageLoops on
 // Android
 class MessagePumpForUI : public MessagePump {
@@ -66,9 +54,6 @@ class MessagePumpForUI : public MessagePump {
 
   bool work_scheduled;
 
-  // MessagePump implementation for Android based on the GLib implement.
-  MessagePumpAndroid pump;
-
   DISALLOW_COPY_AND_ASSIGN(MessagePumpForUI);
 };