Make members of Singleton<T> private and only visible to the singleton type.

chrome/browser/safe_browsing/safe_browsing_blocking_page.cc

Index: chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
diff --git a/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc b/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
index 7ec030397994daa5af72c9c5a60ccec7afa8eda6..2bc0a4952b7958e033f4f73bb074f2bd0fe811a4 100644
--- a/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
@@ -76,6 +76,9 @@ static const char* const kTakeMeBackCommand = "takeMeBack";
 // static
 SafeBrowsingBlockingPageFactory* SafeBrowsingBlockingPage::factory_ = NULL;
 
+static base::LazyInstance<SafeBrowsingBlockingPage::UnsafeResourceMap>
+    g_unsafe_resource_map(base::LINKER_INITIALIZED);
+
 // The default SafeBrowsingBlockingPageFactory.  Global, made a singleton so we
 // don't leak it.
 class SafeBrowsingBlockingPageFactoryImpl
@@ -559,7 +562,7 @@ void SafeBrowsingBlockingPage::NotifySafeBrowsingService(
 // static
 SafeBrowsingBlockingPage::UnsafeResourceMap*
     SafeBrowsingBlockingPage::GetUnsafeResourcesMap() {
-  return Singleton<UnsafeResourceMap>::get();
+  return g_unsafe_resource_map.Pointer();
 }
 
 // static