Add the network service as a data dependency of html_viewer for Android.

The corresponding desktop CL: https://codereview.chromium.org/1090753002

BUG=NONE
TEST=Building html_viewer from scratch also builds the network service.
R=sky@chromium.org

Review URL: https://codereview.chromium.org/1097503002

Cr-Commit-Position: refs/heads/master@{#325501}

mojo/services/html_viewer/BUILD.gn

@@ -166,6 +166,8 @@ if (is_android) {
       "//base",
       "//ui/gfx:gfx_jni_headers",
     ]
+
+    data_deps = [ "//mojo/services/network:network" ]
   }
 
   generate_jni("html_viewer_jni_headers") {