Move memory histograms generation to MetricsMemoryDetails.

chrome/browser/ui/webui/about_ui.cc

Index: chrome/browser/ui/webui/about_ui.cc
diff --git a/chrome/browser/ui/webui/about_ui.cc b/chrome/browser/ui/webui/about_ui.cc
index 3dbe9e6de797bdb222faabc3d8a38fe0fd28c97a..05797169e5fa6cff32f456aaf91efe18f86cfb08 100644
--- a/chrome/browser/ui/webui/about_ui.cc
+++ b/chrome/browser/ui/webui/about_ui.cc
@@ -645,8 +645,7 @@ void FinishMemoryDataRequest(
     // The AboutMemoryHandler cleans itself up, but |StartFetch()| will want
     // the refcount to be greater than 0.
     scoped_refptr<AboutMemoryHandler> handler(new AboutMemoryHandler(callback));
-    // TODO(jamescook): Maybe this shouldn't update UMA?
-    handler->StartFetch(MemoryDetails::UPDATE_USER_METRICS);
+    handler->StartFetch();
   } else {
     int id = IDR_ABOUT_MEMORY_HTML;
     if (path == kMemoryJsPath) {