Moving gRPC support interfaces out of cronet and into a new component.

components/grpc_support/cronet_bidirectional_stream.cc

Index: components/grpc_support/cronet_bidirectional_stream.cc
diff --git a/components/cronet/ios/cronet_bidirectional_stream.cc b/components/grpc_support/cronet_bidirectional_stream.cc
similarity index 98%
rename from components/cronet/ios/cronet_bidirectional_stream.cc
rename to components/grpc_support/cronet_bidirectional_stream.cc
index 59a82085f8f268df0e99e330369c0642d2497126..68dba1b759512bc5389e7c089a772f055d034bd8 100644
--- a/components/cronet/ios/cronet_bidirectional_stream.cc
+++ b/components/grpc_support/cronet_bidirectional_stream.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/cronet/ios/cronet_bidirectional_stream.h"
+#include "components/grpc_support/cronet_bidirectional_stream.h"
 
 #include <memory>
 #include <string>
@@ -13,7 +13,7 @@
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_number_conversions.h"
-#include "components/cronet/ios/cronet_environment.h"
+#include "components/grpc_support/environment.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/request_priority.h"
@@ -30,7 +30,7 @@
 #include "net/url_request/url_request_context.h"
 #include "url/gurl.h"
 
-namespace cronet {
+namespace grpc_support {
 
 CronetBidirectionalStream::WriteBuffers::WriteBuffers() {}
 
@@ -61,7 +61,7 @@ bool CronetBidirectionalStream::WriteBuffers::Empty() const {
 }
 
 CronetBidirectionalStream::CronetBidirectionalStream(
-    CronetEnvironment* environment,
+    Environment* environment,
     Delegate* delegate)
     : read_state_(NOT_STARTED),
       write_state_(NOT_STARTED),
@@ -245,7 +245,7 @@ void CronetBidirectionalStream::StartOnNetworkThread(
   DCHECK(!bidi_stream_);
   DCHECK(environment_->GetURLRequestContext());
   request_info->extra_headers.SetHeaderIfMissing(
-      net::HttpRequestHeaders::kUserAgent, environment_->user_agent());
+      net::HttpRequestHeaders::kUserAgent, environment_->UserAgent());
   bidi_stream_.reset(new net::BidirectionalStream(
       std::move(request_info), environment_->GetURLRequestContext()
                                    ->http_transaction_factory()