Remove unused fields from //content.

content/browser/leveldb_wrapper_impl.h

Index: content/browser/leveldb_wrapper_impl.h
diff --git a/content/browser/leveldb_wrapper_impl.h b/content/browser/leveldb_wrapper_impl.h
index c96edf9ca6bca9c191351e910cd854d214200007..160e79eb78dab1ce14414bd12c4420b1f203c73a 100644
--- a/content/browser/leveldb_wrapper_impl.h
+++ b/content/browser/leveldb_wrapper_impl.h
@@ -25,8 +25,7 @@ class LevelDBWrapperImpl : public mojom::LevelDBWrapper {
  public:
   // |no_bindings_callback| will be called when this object has no more
   // bindings.
-  LevelDBWrapperImpl(leveldb::LevelDBDatabase* database,
-                     const std::string& prefix,
+  LevelDBWrapperImpl(const std::string& prefix,
                      size_t max_size,
                      const base::Closure& no_bindings_callback);
   ~LevelDBWrapperImpl() override;
@@ -55,7 +54,6 @@ class LevelDBWrapperImpl : public mojom::LevelDBWrapper {
   mojo::BindingSet<mojom::LevelDBWrapper> bindings_;
   mojo::InterfacePtrSet<mojom::LevelDBObserver> observers_;
   base::Closure no_bindings_callback_;
-  leveldb::LevelDBDatabase* database_;
   std::map<mojo::Array<uint8_t>, mojo::Array<uint8_t>> map_;
   size_t bytes_used_;
   size_t max_size_;