Make operators on scoped_ptr match the ones defined for std::unique_ptr

cc/raster/one_copy_tile_task_worker_pool.cc

Index: cc/raster/one_copy_tile_task_worker_pool.cc
diff --git a/cc/raster/one_copy_tile_task_worker_pool.cc b/cc/raster/one_copy_tile_task_worker_pool.cc
index 5aa1aaad9bc8ee15eb3f60aa8f981f7bf89d1862..dc1d118280422b81f4d0b03dc53b893d164c96ce 100644
--- a/cc/raster/one_copy_tile_task_worker_pool.cc
+++ b/cc/raster/one_copy_tile_task_worker_pool.cc
@@ -540,10 +540,14 @@ bool OneCopyTileTaskWorkerPool::OnMemoryDump(
     base::trace_event::ProcessMemoryDump* pmd) {
   base::AutoLock lock(lock_);
 
-  for (const auto& buffer : buffers_) {
+  for (const auto* buffer : buffers_) {
+    auto in_free_buffers =
+        std::find_if(free_buffers_.begin(), free_buffers_.end(),
+                     [buffer](const scoped_ptr<StagingBuffer>& b) {
+                       return b.get() == buffer;
+                     });
     buffer->OnMemoryDump(pmd, buffer->format,
-                         std::find(free_buffers_.begin(), free_buffers_.end(),
-                                   buffer) != free_buffers_.end());
+                         in_free_buffers != free_buffers_.end());
   }
 
   return true;