Create and pass shared-histogram-allocator from browser to renderer.

content/browser/histogram_controller.cc

Index: content/browser/histogram_controller.cc
diff --git a/content/browser/histogram_controller.cc b/content/browser/histogram_controller.cc
index 6106e64e4ea617353129c8c15c36dd4f2fb3aeab..052bd7a5bd71ead652fc958d975aad70214f6358 100644
--- a/content/browser/histogram_controller.cc
+++ b/content/browser/histogram_controller.cc
@@ -89,8 +89,10 @@ void HistogramController::GetHistogramDataFromChildProcesses(
       continue;
 
     ++pending_processes;
-    if (!iter.Send(new ChildProcessMsg_GetChildHistogramData(sequence_number)))
+    if (!iter.Send(new ChildProcessMsg_GetChildNonPersistentHistogramData(
+            sequence_number))) {
       --pending_processes;
+    }
   }
 
   BrowserThread::PostTask(
@@ -112,7 +114,8 @@ void HistogramController::GetHistogramData(int sequence_number) {
        !it.IsAtEnd(); it.Advance()) {
     ++pending_processes;
     if (!it.GetCurrentValue()->Send(
-            new ChildProcessMsg_GetChildHistogramData(sequence_number))) {
+            new ChildProcessMsg_GetChildNonPersistentHistogramData(
+                sequence_number))) {
       --pending_processes;
     }
   }