Move Pickle to base namespace.

chrome/browser/ui/views/extensions/browser_action_drag_data.h

Index: chrome/browser/ui/views/extensions/browser_action_drag_data.h
diff --git a/chrome/browser/ui/views/extensions/browser_action_drag_data.h b/chrome/browser/ui/views/extensions/browser_action_drag_data.h
index 39ebd335711aedfef9dda6cc800e76008fc7e963..ed36426cdbbcd50e1221ba8efbb835f944ed40f4 100644
--- a/chrome/browser/ui/views/extensions/browser_action_drag_data.h
+++ b/chrome/browser/ui/views/extensions/browser_action_drag_data.h
@@ -13,9 +13,12 @@
 #include "ui/base/dragdrop/os_exchange_data.h"
 #endif
 
-class Pickle;
 class Profile;
 
+namespace base {
+class Pickle;
+}
+
 class BrowserActionDragData {
  public:
   BrowserActionDragData();
@@ -47,8 +50,8 @@ class BrowserActionDragData {
 #endif
 
  private:
-  void WriteToPickle(Profile* profile, Pickle* pickle) const;
-  bool ReadFromPickle(Pickle* pickle);
+  void WriteToPickle(Profile* profile, base::Pickle* pickle) const;
+  bool ReadFromPickle(base::Pickle* pickle);
 
   // The profile we originated from.
   void* profile_;