Move InstanceID field trial check to extension-specific code

components/gcm_driver/instance_id/instance_id_driver.cc

Index: components/gcm_driver/instance_id/instance_id_driver.cc
diff --git a/components/gcm_driver/instance_id/instance_id_driver.cc b/components/gcm_driver/instance_id/instance_id_driver.cc
index 9ec01c46b39266d835cd4d58604207f07dc775c8..31585bff27bae8525d4ee5f26200cb44ccf97439 100644
--- a/components/gcm_driver/instance_id/instance_id_driver.cc
+++ b/components/gcm_driver/instance_id/instance_id_driver.cc
@@ -4,28 +4,18 @@
 
 #include "components/gcm_driver/instance_id/instance_id_driver.h"
 
-#include "base/metrics/field_trial.h"
 #include "build/build_config.h"
 #include "components/gcm_driver/instance_id/instance_id.h"
 
 namespace instance_id {
 
-namespace {
-#if !defined(OS_ANDROID)
-const char kInstanceIDFieldTrialName[] = "InstanceID";
-const char kInstanceIDFieldTrialEnabledGroupName[] = "Enabled";
-#endif    // !defined(OS_ANDROID)
-}  // namespace
-
 // static
 bool InstanceIDDriver::IsInstanceIDEnabled() {
 #if defined(OS_ANDROID)
   // Not implemented yet.
   return false;
 #else
-  std::string group_name =
-      base::FieldTrialList::FindFullName(kInstanceIDFieldTrialName);
-  return group_name == kInstanceIDFieldTrialEnabledGroupName;
+  return true;
 #endif    // defined(OS_ANDROID)
 }