GN: Add -Wl,-z defs on linux and fix errors

content/test/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
@@ skipping 203 matching lines @@
       "//cc/blink",
       "//content/public/common",
       "//skia",
       "//v8",
       "//ui/accessibility:ax_gen",
     ]
 
     if (is_android) {
       deps += [ ":jni" ]
     }
+
+    if (!enable_webrtc) {
+      sources -= [
+        "test_media_stream_renderer_factory.cc",
+        "test_media_stream_renderer_factory.h",
+      ]
+    }
   }
 
   if (is_android) {
     import("//build/config/android/rules.gni")
 
     generate_jni("jni") {
       sources = [
         "../public/test/android/javatests/src/org/chromium/content/browser/test/NestedSystemMessageHandler.java",
       ]
       jni_package = "content/public/test"
@@ skipping 445 matching lines @@
       "//content/public/common",
       "//testing/gtest",
       "//third_party/WebKit/public:blink",
       "//ui/base",
       "//ui/gfx",
       "//ui/gfx/geometry",
       "//ui/gl",
     ]
   }
 }