Fix 'gn check' errors found in nacl_trusted_plugin target.

$ gn gen out-gn
$ gn check out-gn //components/nacl/renderer/plugin/*

BUG=367595,376000
TEST=see above
R=bradnelson@google.com,brettw@chromium.org
TBR=bradnelson@chromium.org

Review URL: https://codereview.chromium.org/1034193003

Cr-Commit-Position: refs/heads/master@{#322478}

components/nacl/renderer/plugin/BUILD.gn

@@ -20,6 +20,7 @@ source_set("nacl_trusted_plugin") {
   ]
 
   deps = [
+    "//base",
     "//media:shared_memory_support",
     "//native_client/src/shared/gio",
     "//native_client/src/shared/imc",
@@ -29,6 +30,7 @@ source_set("nacl_trusted_plugin") {
     "//native_client/src/trusted/platform_qualify:platform_qual_lib",
     "//native_client/src/trusted/simple_service",
     "//native_client/src/trusted/weak_ref",
+    "//ppapi/c",
     "//ppapi/cpp:objects",
     "//ppapi/cpp/private:internal_module",
   ]