Convert string16 to base::string16 in content.

content/renderer/renderer_clipboard_client.h

Index: content/renderer/renderer_clipboard_client.h
diff --git a/content/renderer/renderer_clipboard_client.h b/content/renderer/renderer_clipboard_client.h
index 1635a2bfb1738201c07e18e823dfde49b4e539cd..96d05b2621a7c1f14714a27b02e667cb5442d2f7 100644
--- a/content/renderer/renderer_clipboard_client.h
+++ b/content/renderer/renderer_clipboard_client.h
@@ -22,22 +22,22 @@ class RendererClipboardClient : public ClipboardClient {
                                  ui::ClipboardType type) OVERRIDE;
   virtual void Clear(ui::ClipboardType type) OVERRIDE;
   virtual void ReadAvailableTypes(ui::ClipboardType type,
-                                  std::vector<string16>* types,
+                                  std::vector<base::string16>* types,
                                   bool* contains_filenames) OVERRIDE;
   virtual void ReadText(ui::ClipboardType type,
-                        string16* result) OVERRIDE;
+                        base::string16* result) OVERRIDE;
   virtual void ReadAsciiText(ui::ClipboardType type,
                              std::string* result) OVERRIDE;
   virtual void ReadHTML(ui::ClipboardType type,
-                        string16* markup,
+                        base::string16* markup,
                         GURL* url,
                         uint32* fragment_start,
                         uint32* fragment_end) OVERRIDE;
   virtual void ReadRTF(ui::ClipboardType type, std::string* result) OVERRIDE;
   virtual void ReadImage(ui::ClipboardType type, std::string* data) OVERRIDE;
   virtual void ReadCustomData(ui::ClipboardType clipboard_type,
-                              const string16& type,
-                              string16* data) OVERRIDE;
+                              const base::string16& type,
+                              base::string16* data) OVERRIDE;
   virtual void ReadData(const ui::Clipboard::FormatType& format,
                         std::string* data) OVERRIDE;
   virtual WriteContext* CreateWriteContext() OVERRIDE;