Convert //tools to use std::unique_ptr

tools/gn/input_file_manager.h

Index: tools/gn/input_file_manager.h
diff --git a/tools/gn/input_file_manager.h b/tools/gn/input_file_manager.h
index 38ff37e721132511f33dae430f4a5306ffb6c41f..ba055e219c57bbc18ce2943ffcdd14491fec9b0c 100644
--- a/tools/gn/input_file_manager.h
+++ b/tools/gn/input_file_manager.h
@@ -82,7 +82,7 @@ class InputFileManager : public base::RefCountedThreadSafe<InputFileManager> {
   void AddDynamicInput(const SourceFile& name,
                        InputFile** file,
                        std::vector<Token>** tokens,
-                       scoped_ptr<ParseNode>** parse_root);
+                       std::unique_ptr<ParseNode>** parse_root);
 
   // Does not count dynamic input.
   int GetInputFileCount() const;
@@ -111,12 +111,12 @@ class InputFileManager : public base::RefCountedThreadSafe<InputFileManager> {
     // Event to signal when the load is complete (or fails). This is lazily
     // created only when a thread is synchronously waiting for this load (which
     // only happens for imports).
-    scoped_ptr<base::WaitableEvent> completion_event;
+    std::unique_ptr<base::WaitableEvent> completion_event;
 
     std::vector<Token> tokens;
 
     // Null before the file is loaded or if loading failed.
-    scoped_ptr<ParseNode> parsed_root;
+    std::unique_ptr<ParseNode> parsed_root;
     Err parse_error;
   };