GN Don't enable linker version script for components

It breaks native JNI exporting. Change aligns with GYP behaviour.

BUG=532905

Review URL: https://codereview.chromium.org/1548473003

Cr-Commit-Position: refs/heads/master@{#367470}
diff --git a/content/BUILD.gn b/content/BUILD.gn
index 56be979..cb50de5 100644
--- a/content/BUILD.gn
+++ b/content/BUILD.gn
@@ -56,7 +56,7 @@
 }
 
 if (is_component_build) {
-  shared_library("content") {
+  component("content") {
     public_deps =
         content_shared_components + [ "//content/public/app:both_sources" ]
     deps = [