Remove mojo::String.

content/child/mojo/type_converters.h

Index: content/child/mojo/type_converters.h
diff --git a/content/child/mojo/type_converters.h b/content/child/mojo/type_converters.h
index 1a9a5bb9527a8e43baf1431210f6781a0dfdfa55..180cadb6f5476750a44f2564908cadc0a2598df0 100644
--- a/content/child/mojo/type_converters.h
+++ b/content/child/mojo/type_converters.h
@@ -6,7 +6,6 @@
 #include <utility>
 
 #include "mojo/public/cpp/bindings/array.h"
-#include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 
 namespace mojo {
@@ -21,11 +20,4 @@ struct TypeConverter<Array<T>, blink::WebVector<U>> {
   }
 };
 
-template <>
-struct TypeConverter<String, blink::WebString> {
-  static String Convert(const blink::WebString& web_string) {
-    return String(web_string.utf8());
-  }
-};
-
 }  // namespace mojo