blimp: Cleanup class/struct forward declarations

blimp/client/app/android/blimp_client_session_android.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BLIMP_CLIENT_APP_ANDROID_BLIMP_CLIENT_SESSION_ANDROID_H_
 #define BLIMP_CLIENT_APP_ANDROID_BLIMP_CLIENT_SESSION_ANDROID_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "blimp/client/app/session/blimp_client_session.h"
 #include "blimp/client/core/contents/android/ime_helper_dialog.h"
 #include "blimp/client/public/session/assignment.h"
 
 namespace blimp {
 namespace client {
 
-class AssignmentSource;
-
 class BlimpClientSessionAndroid : public BlimpClientSession {
  public:
   static bool RegisterJni(JNIEnv* env);
   static BlimpClientSessionAndroid* FromJavaObject(
       JNIEnv* env,
       const base::android::JavaRef<jobject>& jobj);
 
   BlimpClientSessionAndroid(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& jobj,
@@ skipping 32 matching lines @@
   // Reference to the Java object which owns this class.
   base::android::ScopedJavaGlobalRef<jobject> java_obj_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpClientSessionAndroid);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_APP_ANDROID_BLIMP_CLIENT_SESSION_ANDROID_H_