cc: Remove InUseByMacOSWindowServer

cc/resources/resource_pool.cc

Index: cc/resources/resource_pool.cc
diff --git a/cc/resources/resource_pool.cc b/cc/resources/resource_pool.cc
index 38ec99d227ece7b4d3368cf019db98f1667341a5..0ec24005a49e8e40af31fc771f559a69fbd83845 100644
--- a/cc/resources/resource_pool.cc
+++ b/cc/resources/resource_pool.cc
@@ -102,11 +102,7 @@ Resource* ResourcePool::AcquireResource(const gfx::Size& size,
   for (ResourceDeque::iterator it = unused_resources_.begin();
        it != unused_resources_.end(); ++it) {
     ScopedResource* resource = it->get();
-    // TODO(ccameron): The allowance for IsInUseByMacOSWindowServer should not
-    // be needed.
-    // http://crbug.com/577121
-    DCHECK(resource_provider_->CanLockForWrite(resource->id()) ||
-           resource_provider_->IsInUseByMacOSWindowServer(resource->id()));
+    DCHECK(resource_provider_->CanLockForWrite(resource->id()));
 
     if (resource->format() != format)
       continue;
@@ -156,11 +152,7 @@ Resource* ResourcePool::TryAcquireResourceWithContentId(uint64_t content_id) {
     return nullptr;
 
   Resource* resource = it->get();
-  // TODO(ccameron): The allowance for IsInUseByMacOSWindowServer should not
-  // be needed.
-  // http://crbug.com/577121
-  DCHECK(resource_provider_->CanLockForWrite(resource->id()) ||
-         resource_provider_->IsInUseByMacOSWindowServer(resource->id()));
+  DCHECK(resource_provider_->CanLockForWrite(resource->id()));
 
   // Transfer resource to |in_use_resources_|.
   in_use_resources_[resource->id()] = std::move(*it);