Change most uses of Pickle to base::Pickle

ui/base/clipboard/scoped_clipboard_writer.cc

Index: ui/base/clipboard/scoped_clipboard_writer.cc
diff --git a/ui/base/clipboard/scoped_clipboard_writer.cc b/ui/base/clipboard/scoped_clipboard_writer.cc
index 5044f62d41f88cd4d05c4e4d4f58a79f4e3fc849..6850cd460b1d4ac94996a7012848ea3f6d2da878 100644
--- a/ui/base/clipboard/scoped_clipboard_writer.cc
+++ b/ui/base/clipboard/scoped_clipboard_writer.cc
@@ -103,7 +103,8 @@ void ScopedClipboardWriter::WriteImage(const SkBitmap& bitmap) {
 }
 
 void ScopedClipboardWriter::WritePickledData(
-    const Pickle& pickle, const Clipboard::FormatType& format) {
+    const base::Pickle& pickle,
+    const Clipboard::FormatType& format) {
   std::string format_string = format.Serialize();
   Clipboard::ObjectMapParam format_parameter(format_string.begin(),
                                              format_string.end());