Enable InstanceID field trial by default

chrome/browser/extensions/api/instance_id/instance_id_apitest.cc

Index: chrome/browser/extensions/api/instance_id/instance_id_apitest.cc
diff --git a/chrome/browser/extensions/api/instance_id/instance_id_apitest.cc b/chrome/browser/extensions/api/instance_id/instance_id_apitest.cc
index 646fab0801762c2a178b8996ef74c1653ff0005e..22b69be64aaa233d8799f0766bf2711ad242d879 100644
--- a/chrome/browser/extensions/api/instance_id/instance_id_apitest.cc
+++ b/chrome/browser/extensions/api/instance_id/instance_id_apitest.cc
@@ -4,7 +4,6 @@
 
 #include <utility>
 
-#include "base/base_switches.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
@@ -42,7 +41,6 @@ class InstanceIDApiTest : public ExtensionApiTest {
 
  protected:
   void SetUpOnMainThread() override;
-  void SetUpCommandLine(base::CommandLine* command_line) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstanceIDApiTest);
@@ -58,14 +56,6 @@ void InstanceIDApiTest::SetUpOnMainThread() {
   ExtensionApiTest::SetUpOnMainThread();
 }
 
-void InstanceIDApiTest::SetUpCommandLine(base::CommandLine* command_line) {
-  ExtensionApiTest::SetUpCommandLine(command_line);
-
-  // Makes sure InstanceID is enabled for testing.
-  command_line->AppendSwitchASCII(
-       switches::kForceFieldTrials, "InstanceID/Enabled/");
-}
-
 IN_PROC_BROWSER_TEST_F(InstanceIDApiTest, GetID) {
   ASSERT_TRUE(RunExtensionTest("instance_id/get_id"));
 }