Consolidates accessing and setting the UMA pref to be within metrics code

chrome/browser/ui/webui/options/core_options_handler.cc

Index: chrome/browser/ui/webui/options/core_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/core_options_handler.cc b/chrome/browser/ui/webui/options/core_options_handler.cc
index f4c359b1ab5d1b89cbffe3a277d57915b17c0810..a844dd0343cd30d507e01253f74a832eac277d4f 100644
--- a/chrome/browser/ui/webui/options/core_options_handler.cc
+++ b/chrome/browser/ui/webui/options/core_options_handler.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/callback.h"
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
@@ -43,18 +44,6 @@ namespace options {
 
 namespace {
 
-// Only allow changes to the metrics reporting checkbox if we were succesfully
-// able to change the service.
-bool AllowMetricsReportingChange(const base::Value* to_value) {
-  bool enable;
-  if (!to_value->GetAsBoolean(&enable)) {
-    NOTREACHED();
-    return false;
-  }
-
-  return enable == ResolveMetricsReportingEnabled(enable);
-}
-
 // Whether "controlledBy" property of pref value sent to options web UI needs to
 // be set to "extension" when the preference is controlled by an extension.
 bool CanSetExtensionControlledPrefValue(
@@ -89,9 +78,6 @@ void CoreOptionsHandler::InitializeHandler() {
       base::Bind(&CoreOptionsHandler::OnPreferenceChanged,
                  base::Unretained(this),
                  profile->GetPrefs()));
-
-  pref_change_filters_[prefs::kMetricsReportingEnabled] =
-      base::Bind(&AllowMetricsReportingChange);
 }
 
 void CoreOptionsHandler::InitializePage() {
@@ -238,6 +224,9 @@ void CoreOptionsHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback("disableExtension",
       base::Bind(&CoreOptionsHandler::HandleDisableExtension,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("coreOptionsMetricsReportingChange",
+      base::Bind(&CoreOptionsHandler::HandleMetricsReportingChange,
+                 base::Unretained(this)));
 }
 
 void CoreOptionsHandler::HandleInitialize(const base::ListValue* args) {
@@ -643,6 +632,24 @@ void CoreOptionsHandler::HandleDisableExtension(const base::ListValue* args) {
   }
 }
 
+void CoreOptionsHandler::HandleMetricsReportingChange(
+    const base::ListValue* args) {
+  base::Callback<void(bool)> callback_fn = base::Bind(
+      &CoreOptionsHandler::MetricsReportingChangeCallback,
+      base::Unretained(this));
+  bool enable;
+  if (args->GetBoolean(0, &enable)) {
+    InitiateMetricsReportingChange(callback_fn, enable);
+  }
+}
+
+void CoreOptionsHandler::MetricsReportingChangeCallback(bool success) {
+  base::DictionaryValue* dict = new base::DictionaryValue;
+  dict->SetBoolean("success", success);
+  web_ui()->CallJavascriptFunction(
+      "BrowserOptions.setMetricsReportingJSCallback", *dict);
+}
+
 void CoreOptionsHandler::UpdateClearPluginLSOData() {
   base::FundamentalValue enabled(
           plugin_status_pref_setter_.IsClearPluginLSODataEnabled());