Fix media_mojo builds

media/mojo/services/BUILD.gn

Index: media/mojo/services/BUILD.gn
diff --git a/media/mojo/services/BUILD.gn b/media/mojo/services/BUILD.gn
index 432130d01c557fa2c89f4901d53077f54c5eabea..3eccceb652e5eb9aa735d5dca26b43407eec2f84 100644
--- a/media/mojo/services/BUILD.gn
+++ b/media/mojo/services/BUILD.gn
@@ -138,10 +138,10 @@ source_set("lib") {
 service("media") {
   testonly = true
 
-  # crbug.com/676418: Suppress symbol import warnings.
-  if (is_win && is_component_build) {
-    ldflags = [ "/ignore:4217" ]
-  }
+  # As long as //media/mojo/services:lib is a source_set, this needs to be
+  # set as the source will be bundled with this service code.

[xhwang, 2017/03/08 00:35:18]

Could you please provide a few more details, e.g. the import/export is causing
conflict...

+  # http://crbug.com/670094
+  defines = [ "MEDIA_MOJO_IMPLEMENTATION" ]
 
   sources = [
     "main.cc",