Some fixes for gn examples

Fixes up various dependency bugs that prevent mojo_demo_launcher +
mojo_html_viewer from working.

Once we are gn check clean this should be easy to enforce with a script,
but for now it's manual testing.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/608023002

Cr-Commit-Position: refs/heads/master@{#297023}

mojo/examples/demo_launcher/BUILD.gn

@@ -25,6 +25,7 @@ shared_library("demo_launcher") {
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/utility",
     "//mojo/public/gles2:for_shared_library",
+    "//mojo/services/public/cpp/view_manager",
     "//mojo/services/public/interfaces/geometry",
     "//mojo/services/public/interfaces/view_manager",
   ]

mojo/services/html_viewer/BUILD.gn

@@ -43,6 +43,8 @@ shared_library("html_viewer") {
   include_dirs = [ "third_party/WebKit" ]
 
   deps = [
+    "//base",
+    "//base/third_party/dynamic_annotations",
     "//cc",
     "//cc/blink",
     "//cc/surfaces",

mojo/services/public/cpp/network/BUILD.gn

@@ -3,7 +3,7 @@
 # found in the LICENSE file.
 
 # GYP version: mojo/mojo_services.gypi:mojo_network_utility
-component("network") {
+source_set("network") {
   deps = [
     "//base",
     "//mojo/application",