Revert of Remove ignored return code from modules.

webrtc/modules/include/module.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 14 matching lines @@
   // be called on.
   // TODO(tommi): Almost all implementations of this function, need to know
   // the current tick count.  Consider passing it as an argument.  It could
   // also improve the accuracy of when the next callback occurs since the
   // thread that calls Process() will also have it's tick count reference
   // which might not match with what the implementations use.
   virtual int64_t TimeUntilNextProcess() = 0;
 
   // Process any pending tasks such as timeouts.
   // Called on a worker thread.
-  virtual void Process() = 0;
+  virtual int32_t Process() = 0;
 
   // This method is called when the module is attached to a *running* process
   // thread or detached from one.  In the case of detaching, |process_thread|
   // will be nullptr.
   //
   // This method will be called in the following cases:
   //
   // * Non-null process_thread:
   //   * ProcessThread::RegisterModule() is called while the thread is running.
   //   * ProcessThread::Start() is called and RegisterModule has previously
@@ skipping 26 matching lines @@
   // When the reference count reaches 0 the object will self-destruct.
   virtual int32_t Release() const = 0;
 
  protected:
   ~RefCountedModule() override = default;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_INCLUDE_MODULE_H_