Remove interface directories kept to avoid breaking downstream.

webrtc/modules/utility/interface/helpers_ios.h

Index: webrtc/modules/utility/interface/helpers_ios.h
diff --git a/webrtc/modules/utility/interface/helpers_ios.h b/webrtc/modules/utility/interface/helpers_ios.h
deleted file mode 100644
index 6013ee9c14f09276fa27cdc2a4d8e54f5e0a9a6c..0000000000000000000000000000000000000000
--- a/webrtc/modules/utility/interface/helpers_ios.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- *  Copyright (c) 2015 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.
- */
-
-#ifndef WEBRTC_MODULES_UTILITY_INCLUDE_HELPERS_IOS_H_
-#define WEBRTC_MODULES_UTILITY_INCLUDE_HELPERS_IOS_H_
-
-#pragma message("WARNING: utility/interface is DEPRECATED; use utility/include")
-
-#if defined(WEBRTC_IOS)
-
-#include <string>
-
-namespace webrtc {
-namespace ios {
-
-bool CheckAndLogError(BOOL success, NSError* error);
-
-std::string StdStringFromNSString(NSString* nsString);
-
-// Return thread ID as a string.
-std::string GetThreadId();
-
-// Return thread ID as string suitable for debug logging.
-std::string GetThreadInfo();
-
-// Returns [NSThread currentThread] description as string.
-// Example: <NSThread: 0x170066d80>{number = 1, name = main}
-std::string GetCurrentThreadDescription();
-
-std::string GetAudioSessionCategory();
-
-// Returns the current name of the operating system.
-std::string GetSystemName();
-
-// Returns the current version of the operating system.
-std::string GetSystemVersion();
-
-// Returns the version of the operating system as a floating point value.
-float GetSystemVersionAsFloat();
-
-// Returns the device type.
-// Examples: ”iPhone” and ”iPod touch”.
-std::string GetDeviceType();
-
-// Returns a more detailed device name.
-// Examples: "iPhone 5s (GSM)" and "iPhone 6 Plus".
-std::string GetDeviceName();
-
-}  // namespace ios
-}  // namespace webrtc
-
-#endif  // defined(WEBRTC_IOS)
-
-#endif  // WEBRTC_MODULES_UTILITY_INCLUDE_HELPERS_IOS_H_