Fix extensions targets building without chrome

extensions/BUILD.gn

Index: extensions/BUILD.gn
diff --git a/extensions/BUILD.gn b/extensions/BUILD.gn
index b0215fc5d5d4479fe5cc7b58ddda0f8b65da7d6f..2a46ad3ca8f338957dce11dc8756362ea68c9d4c 100644
--- a/extensions/BUILD.gn
+++ b/extensions/BUILD.gn
@@ -52,6 +52,7 @@ grit("extensions_renderer_resources") {
 
   deps = [
     "//chrome/browser/media/router:mojo_bindings__generator",
+    "//chrome/browser/media/router:mojo_bindings_common",

[Devlin, 2017/04/11 23:02:56]

Does mojo_bindings_common__generator work?

[michaelpg, 2017/04/12 00:03:29]

It does! It only adds two .stamp files to the generated build line. What I had
adds a LOT more.

Some day I'll learn what STAMP does. and then how these bindings are generated.

     "//device/serial:serial_mojo__generator",
     "//extensions/common:mojo__generator",
     "//extensions/common/api:mojom__generator",