Migrate components/data_reduction_proxy to Mojo interfaces.

net/typemaps.gni

Index: net/typemaps.gni
diff --git a/third_party/leakcanary/config.gni b/net/typemaps.gni
similarity index 76%
copy from third_party/leakcanary/config.gni
copy to net/typemaps.gni
index f6adcddf3ecc4442c7793666dfeecaf1f108fea8..b7689010dfcefee55df55b6ece1c95a25456b3bf 100644
--- a/third_party/leakcanary/config.gni
+++ b/net/typemaps.gni
@@ -2,6 +2,4 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-declare_args() {
-  enable_leakcanary = false
-}
+typemaps = [ "//net/base/mojo/net_base.typemap" ]