Refactor: Inject StatisticsProvider as a dependency of DeviceCloudPolicyInitializer.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index e4e29aeeb7dda960671391a639ab42e29e5de9e1..e6a6d865969ecba9f7fa027cf5c6d2afb5f5021a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -77943,6 +77943,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="52" label="Registration certificate fetch fail">
     A registration certificate could not be obtained from the PCA.
   </int>
+  <int value="53" label="Cannot sign enrollment request">
+    The request to enroll could not be signed.
+  </int>
+  <int value="54" label="Device identification missing">
+    Device model or serial number missing from VPD.
+  </int>
 </enum>
 
 <enum name="EnterprisePolicies" type="int">