Migrate components/data_reduction_proxy to Mojo interfaces.

net/base/mojo/BUILD.gn

Index: net/base/mojo/BUILD.gn
diff --git a/mash/session/public/interfaces/BUILD.gn b/net/base/mojo/BUILD.gn
similarity index 92%
copy from mash/session/public/interfaces/BUILD.gn
copy to net/base/mojo/BUILD.gn
index c4c687528573f0d0be8ca5918b18205347f60767..720b1f72701e4a3f6d0c5249d8e98ce23fe02fd9 100644
--- a/mash/session/public/interfaces/BUILD.gn
+++ b/net/base/mojo/BUILD.gn
@@ -6,6 +6,6 @@ import("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
-    "session.mojom",
+    "net_base.mojom",
   ]
 }