Rework the device management backend implementation.

chrome/browser/profile.cc

Index: chrome/browser/profile.cc
diff --git a/chrome/browser/profile.cc b/chrome/browser/profile.cc
index adf58858c66c7b48ec630d0cd8ac92e3241f1860..635c714fb555c955e67f23e77d457c2e08c3a012 100644
--- a/chrome/browser/profile.cc
+++ b/chrome/browser/profile.cc
@@ -581,6 +581,15 @@ class OffTheRecordProfileImpl : public Profile,
     return profile_->GetExtensionInfoMap();
   }
 
+  virtual policy::DeviceManagementService* GetDeviceManagementService() {
+    return NULL;
+  }
+
+  virtual policy::DeviceManagementPolicyProvider*
+      GetDeviceManagementPolicyProvider() {
+    return NULL;
+  }
+
   virtual PromoCounter* GetInstantPromoCounter() {
     return NULL;
   }