Move memory histograms generation to MetricsMemoryDetails.

chrome/browser/chromeos/memory/oom_priority_manager.cc

Index: chrome/browser/chromeos/memory/oom_priority_manager.cc
diff --git a/chrome/browser/chromeos/memory/oom_priority_manager.cc b/chrome/browser/chromeos/memory/oom_priority_manager.cc
index 6889b90e80061c44b17da125697da28c7d5ad144..668f0770055341e2a4a82f1d6dcfcf1c66869791 100644
--- a/chrome/browser/chromeos/memory/oom_priority_manager.cc
+++ b/chrome/browser/chromeos/memory/oom_priority_manager.cc
@@ -292,7 +292,7 @@ void OomPriorityManager::LogMemoryAndDiscardTab() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   // Deletes itself upon completion.
   OomMemoryDetails* details = new OomMemoryDetails();
-  details->StartFetch(MemoryDetails::SKIP_USER_METRICS);
+  details->StartFetch();
 }
 
 ///////////////////////////////////////////////////////////////////////////////