Remove backwards compatibilty header for ArrayView

rtc_base/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 87 matching lines @@
 
   # TODO(kjellander): Remove (bugs.webrtc.org/7480)
   # Enabling GN check triggers a cyclic dependency caused by rate_limiter.cc:
   #   :rtc_base_approved -> ../system_wrappers -> :rtc_base_approved
   check_includes = false
   defines = []
   libs = []
   deps = []
 
   sources = [
-    "array_view.h",
     "arraysize.h",
     "atomicops.h",
     "base64.cc",
     "base64.h",
     "basictypes.h",
     "bind.h",
     "bitbuffer.cc",
     "bitbuffer.h",
     "buffer.h",
     "bufferqueue.cc",
@@ skipping 1005 matching lines @@
       "java/src/org/webrtc/ContextUtils.java",
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
 
     # TODO(sakal): Fix build hooks crbug.com/webrtc/8148
     no_build_hooks = true
   }
 }