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

components/grpc_support/BUILD.gn

Index: components/grpc_support/BUILD.gn
diff --git a/components/grpc_support/BUILD.gn b/components/grpc_support/BUILD.gn
deleted file mode 100644
index 95ada090b5489b3f99aafcfedd2ab099354595c7..0000000000000000000000000000000000000000
--- a/components/grpc_support/BUILD.gn
+++ /dev/null
@@ -1,33 +0,0 @@
-source_set("grpc_support") {
-  sources = [
-    "bidirectional_stream.cc",
-    "bidirectional_stream.h",
-    "bidirectional_stream_c.cc",
-    "include/bidirectional_stream_c.h",
-  ]
-
-  deps = [
-    "//base",
-    "//net",
-    "//url",
-  ]
-}
-
-source_set("bidirectional_stream_unittest") {
-  testonly = true
-  sources = [
-    "bidirectional_stream_unittest.cc",
-  ]
-
-  deps = [
-    ":grpc_support",
-    "//base",
-    "//components/grpc_support/test:quic_test_server",
-    "//net",
-    "//net:test_support",
-  ]
-
-  public_deps = [
-    "//components/grpc_support/test:get_stream_engine_header",
-  ]
-}