Migrate components/data_reduction_proxy to Mojo interfaces.

components/data_reduction_proxy/content/common/BUILD.gn

Index: components/data_reduction_proxy/content/common/BUILD.gn
diff --git a/components/data_reduction_proxy/content/common/BUILD.gn b/components/data_reduction_proxy/content/common/BUILD.gn
index cb33fbee498d4127521eb631ae39c2e1a9b92d07..f57cad2b73682b51a2b008eb086255c702cf6f32 100644
--- a/components/data_reduction_proxy/content/common/BUILD.gn
+++ b/components/data_reduction_proxy/content/common/BUILD.gn
@@ -2,15 +2,13 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-static_library("common") {
+import("//mojo/public/tools/bindings/mojom.gni")
+
+mojom("common") {
   sources = [
-    "data_reduction_proxy_messages.cc",
-    "data_reduction_proxy_messages.h",
+    "data_reduction_proxy.mojom",
   ]
-
-  deps = [
-    "//content/public/common",
-    "//ipc",
-    "//net",
+  public_deps = [
+    "//net/base/mojo:interfaces",
   ]
 }