Move clipboard-related webkit_glue embedder functions into a ClipboardClient interface.

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 42ca835b3b3b09fb18c16b4cd254c42cdeb96485..9014f3afa9242416b64a73627edad07199038d45 100644
--- a/ui/base/clipboard/scoped_clipboard_writer.cc
+++ b/ui/base/clipboard/scoped_clipboard_writer.cc
@@ -88,7 +88,7 @@ void ScopedClipboardWriter::WriteWebSmartPaste() {
 void ScopedClipboardWriter::WriteBitmapFromPixels(const void* pixels,
                                                   const gfx::Size& size) {
   Clipboard::ObjectMapParam pixels_parameter, size_parameter;
-  const char* pixels_data = reinterpret_cast<const char*>(pixels);
+  const char* pixels_data = static_cast<const char*>(pixels);
   size_t pixels_length = 4 * size.width() * size.height();
   for (size_t i = 0; i < pixels_length; i++)
     pixels_parameter.push_back(pixels_data[i]);