Convert the pp::proxy namespace to the ppapi::proxy namespace.

ppapi/proxy/ppb_flash_clipboard_proxy.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/proxy/ppb_flash_clipboard_proxy.h"
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/ppb_flash_clipboard.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/serialized_var.h"
 
-namespace pp {
+namespace ppapi {
 namespace proxy {
 
 namespace {
 
 bool IsValidClipboardType(PP_Flash_Clipboard_Type clipboard_type) {
   return clipboard_type == PP_FLASH_CLIPBOARD_TYPE_STANDARD ||
          clipboard_type == PP_FLASH_CLIPBOARD_TYPE_SELECTION ||
          clipboard_type == PP_FLASH_CLIPBOARD_TYPE_DRAG;
 }
 
@@ skipping 131 matching lines @@
     int clipboard_type,
     SerializedVarReceiveInput text) {
   int32_t result = ppb_flash_clipboard_target()->WritePlainText(
       instance_id,
       static_cast<PP_Flash_Clipboard_Type>(clipboard_type),
       text.Get(dispatcher()));
   LOG_IF(WARNING, result != PP_OK) << "Write to clipboard failed unexpectedly.";
 }
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi