Update GCDPrivate API permissions and fix tests

chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc

Index: chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
diff --git a/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc b/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
index bd502da2b7ed4336abd3b254b28d5f1595b3ffef..aec9dd44ca1740766079ee308f6ee76d441579ef 100644
--- a/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
+++ b/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
@@ -213,6 +213,13 @@ class GcdPrivateAPITest : public ExtensionApiTest {
 #endif  // ENABLE_MDNS
   }
 
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    ExtensionApiTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitchASCII(
+        extensions::switches::kWhitelistedExtensionID,
+        "ddchlicdkolnonkihahngkmmmjnjlkkf");
+  }
+
  protected:
   FakeGCDApiFlowFactory api_flow_factory_;