Returning const by ref instead of const by value in File::name() api

BUG=393155

Review URL: https://codereview.chromium.org/1305463002

git-svn-id: svn://svn.chromium.org/blink/trunk@200886 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/fileapi/File.h

@@ -122,7 +122,7 @@ public:
     void appendTo(BlobData&) const override;
 
     const String& path() const { ASSERT(hasValidFilePath()); return m_path; }
-    const String name() const { return m_name; }
+    const String& name() const { return m_name; }
 
     // Getter for the lastModified IDL attribute,
     // http://dev.w3.org/2006/webapi/FileAPI/#file-attrs