Remove DISALLOW_ macro from libcef_dll/ (see issue #3234)

Also perform related C++ cleanup:
- Use =default instead of {} for default implementations of
  constructors/destructors.
- Replace typedef with using.

include/wrapper/cef_scoped_temp_dir.h

@@ -39,7 +39,6 @@
 #pragma once
 
 #include "include/base/cef_build.h"
-#include "include/base/cef_macros.h"
 #include "include/cef_base.h"
 
 ///
@@ -60,6 +59,9 @@ class CefScopedTempDir {
   ///
   CefScopedTempDir();
 
+  CefScopedTempDir(const CefScopedTempDir&) = delete;
+  CefScopedTempDir& operator=(const CefScopedTempDir&) = delete;
+
   ///
   // Recursively delete path.
   ///
@@ -111,8 +113,6 @@ class CefScopedTempDir {
 
  private:
   CefString path_;
-
-  DISALLOW_COPY_AND_ASSIGN(CefScopedTempDir);
 };
 
 #endif  // CEF_INCLUDE_SCOPED_TEMP_DIR_H_