[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr in src/…

cc/resources/prioritized_resource_manager.cc

Index: cc/resources/prioritized_resource_manager.cc
diff --git a/cc/resources/prioritized_resource_manager.cc b/cc/resources/prioritized_resource_manager.cc
index 54ed3089cee2709f954732bcbf523659aed40a6d..f328bae407954a5f4adfe22ecbbb3f87a990f5cc 100644
--- a/cc/resources/prioritized_resource_manager.cc
+++ b/cc/resources/prioritized_resource_manager.cc
@@ -236,7 +236,7 @@ void PrioritizedResourceManager::AcquireBackingTextureIfNeeded(
     return;
 
   // Find a backing below, by either recycling or allocating.
-  PrioritizedResource::Backing* backing = NULL;
+  PrioritizedResource::Backing* backing = nullptr;
 
   // First try to recycle
   for (BackingList::iterator it = backings_.begin(); it != backings_.end();
@@ -431,7 +431,7 @@ void PrioritizedResourceManager::UnregisterTexture(
   DCHECK(ContainsKey(textures_, texture));
 
   ReturnBackingTexture(texture);
-  texture->set_manager_internal(NULL);
+  texture->set_manager_internal(nullptr);
   textures_.erase(texture);
   texture->set_above_priority_cutoff(false);
 }
@@ -525,7 +525,7 @@ void PrioritizedResourceManager::AssertInvariants() {
   // backings that can't be evicted in the backing texture list (otherwise
   // ReduceMemory will not find all textures available for eviction/recycling).
   bool reached_unrecyclable = false;
-  PrioritizedResource::Backing* previous_backing = NULL;
+  PrioritizedResource::Backing* previous_backing = nullptr;
   for (BackingList::iterator it = backings_.begin(); it != backings_.end();
        ++it) {
     PrioritizedResource::Backing* backing = *it;