C++11 declares a type safe null pointer

content/common/font_cache_dispatcher_win.cc

Index: content/common/font_cache_dispatcher_win.cc
diff --git a/content/common/font_cache_dispatcher_win.cc b/content/common/font_cache_dispatcher_win.cc
index 2181a08f98d92d73415941c3cdf92deb25a7acbd..2bdf7c2ca5380514fef52b45fa4b2419a88dc4d0 100644
--- a/content/common/font_cache_dispatcher_win.cc
+++ b/content/common/font_cache_dispatcher_win.cc
@@ -30,12 +30,12 @@ class FontCache {
     // Fetch the font into memory.
     // No matter the font is cached or not, we load it to avoid GDI swapping out
     // that font file.
-    HDC hdc = GetDC(NULL);
+    HDC hdc = GetDC(nullptr);
     HFONT font_handle = CreateFontIndirect(&font);
-    DCHECK(NULL != font_handle);
+    DCHECK(nullptr != font_handle);
 
     HGDIOBJ old_font = SelectObject(hdc, font_handle);
-    DCHECK(NULL != old_font);
+    DCHECK(nullptr != old_font);
 
     TEXTMETRIC tm;
     BOOL ret = GetTextMetrics(hdc, &tm);
@@ -59,7 +59,7 @@ class FontCache {
     } else {  // Requested font is already in cache, release old handles.
       SelectObject(cache_[font_name].dc_, cache_[font_name].old_font_);
       DeleteObject(cache_[font_name].font_);
-      ReleaseDC(NULL, cache_[font_name].dc_);
+      ReleaseDC(nullptr, cache_[font_name].dc_);
     }
     cache_[font_name].font_ = font_handle;
     cache_[font_name].dc_ = hdc;
@@ -100,7 +100,7 @@ class FontCache {
  private:
   struct CacheElement {
     CacheElement()
-        : font_(NULL), old_font_(NULL), dc_(NULL), ref_count_(0) {
+        : font_(nullptr), old_font_(nullptr), dc_(nullptr), ref_count_(0) {
     }
 
     ~CacheElement() {
@@ -111,7 +111,7 @@ class FontCache {
         DeleteObject(font_);
       }
       if (dc_) {
-        ReleaseDC(NULL, dc_);
+        ReleaseDC(nullptr, dc_);
       }
     }
 
@@ -135,7 +135,7 @@ class FontCache {
 }
 
 FontCacheDispatcher::FontCacheDispatcher()
-    : sender_(NULL) {
+    : sender_(nullptr) {
 }
 
 FontCacheDispatcher::~FontCacheDispatcher() {
@@ -157,7 +157,7 @@ bool FontCacheDispatcher::OnMessageReceived(const IPC::Message& message) {
 }
 
 void FontCacheDispatcher::OnChannelClosing() {
-  sender_ = NULL;
+  sender_ = nullptr;
 }
 
 bool FontCacheDispatcher::Send(IPC::Message* message) {