[Cronet] Provide shim from deprecated cronet_c_for_grpc API to bidirectional_stream_c API.

components/cronet/ios/BUILD.gn

 # 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/ios/rules.gni")
 import("//build/config/mac/symbols.gni")
 import("//build/mac/tweak_info_plist.gni")
 import("//build/util/process_version.gni")
 import("//build/util/version.gni")
@@ skipping 35 matching lines @@
 
   sources = [
     "../histogram_manager.cc",
     "../histogram_manager.h",
     "../stale_host_resolver.cc",
     "../stale_host_resolver.h",
     "../url_request_context_config.cc",
     "../url_request_context_config.h",
     "Cronet.h",
     "Cronet.mm",
+    "cronet_c_for_grpc.h",
     "cronet_environment.h",
     "cronet_environment.mm",
   ]
 
   include_dirs = [ "//components/grpc_support/include" ]
 
   if (!use_platform_icu_alternatives) {
     deps += [ "//base:i18n" ]
   }
 }
@@ skipping 80 matching lines @@
   ]
 
   libs = [ "UIKit.Framework" ]
 
   include_dirs = [ "//components/grpc_support/include" ]
 
   public_deps = [
     "//components/grpc_support",
   ]
 
-  public_headers = [ "Cronet.h" ]
+  public_headers = [
+    "Cronet.h",
+    "cronet_c_for_grpc.h",
+  ]
   public_headers += grpc_public_headers
 
   sources = [
     "Cronet.h",
   ]
 
   configs -= [ "//build/config/compiler:default_symbols" ]
   configs += [ "//build/config/compiler:symbols" ]
 }
 
@@ skipping 56 matching lines @@
     ]
   }
 
   group("cronet_package") {
     deps = [
       ":cronet_package_copy",
       ":generate_license",
     ]
   }
 }