Remove custom getters for File.lastModified{Date}

Source/core/fileapi/File.cpp

Index: Source/core/fileapi/File.cpp
diff --git a/Source/core/fileapi/File.cpp b/Source/core/fileapi/File.cpp
index afdc11ce20ef6f4d61def78a32a3bc58be7eaa21..092e32ebc4b6fdfafe62590cc0c0dcab208c3d11 100644
--- a/Source/core/fileapi/File.cpp
+++ b/Source/core/fileapi/File.cpp
@@ -165,7 +165,7 @@ File::File(const KURL& fileSystemURL, const FileMetadata& metadata)
     ScriptWrappable::init(this);
 }
 
-double File::lastModifiedDate() const
+double File::lastModifiedMS() const
 {
     if (hasValidSnapshotMetadata() && isValidFileTime(m_snapshotModificationTime))
         return m_snapshotModificationTime * msPerSecond;
@@ -177,6 +177,28 @@ double File::lastModifiedDate() const
     return currentTime() * msPerSecond;
 }
 
+long long File::lastModified() const
+{
+    double modifiedDate = lastModifiedMS();
+    if (!isValidFileTime(modifiedDate))
+        modifiedDate = currentTimeMS();
+
+    // lastModified returns a number, not a Date instance.
+    // http://dev.w3.org/2006/webapi/FileAPI/#file-attrs
+    return floor(modifiedDate);
+}
+
+double File::lastModifiedDate() const
+{
+    double modifiedDate = lastModifiedMS();
+    if (!isValidFileTime(modifiedDate))
+        modifiedDate = currentTimeMS();
+
+    // lastModifiedDate returns a Date instance.
+    // http://www.w3.org/TR/FileAPI/#file-attrs
+    return modifiedDate;
+}
+
 unsigned long long File::size() const
 {
     if (hasValidSnapshotMetadata())