Partially convert geolocation IPC to Mojo.

content/public/common/BUILD.gn

Index: content/public/common/BUILD.gn
diff --git a/content/public/common/BUILD.gn b/content/public/common/BUILD.gn
index a1244a2b7ea5d541550953c9e8b669a3b84fd3a5..c4d003669dcc8faef1c12c3c12b6e333a0079793 100644
--- a/content/public/common/BUILD.gn
+++ b/content/public/common/BUILD.gn
@@ -4,6 +4,7 @@
 
 import("//build/config/features.gni")
 import("//content/common/common.gni")
+import("//mojo/public/tools/bindings/mojom.gni")
 
 # See //content/BUILD.gn for how this works.
 group("common") {
@@ -43,3 +44,9 @@ source_set("common_sources") {
     ]
   }
 }
+
+mojom("mojo_bindings") {
+  sources = [
+    "mojo_geoposition.mojom",
+  ]
+}