Rename the shared impl files.

ppapi/shared_impl/ppb_font_shared.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/shared_impl/font_impl.h"
+#include "ppapi/shared_impl/ppb_font_shared.h"
 
 #include "ppapi/c/dev/ppb_font_dev.h"
 
 namespace ppapi {
 
 // static
-bool FontImpl::IsPPFontDescriptionValid(const PP_FontDescription_Dev& desc) {
+bool PPB_Font_Shared::IsPPFontDescriptionValid(
+    const PP_FontDescription_Dev& desc) {
   // Check validity of string. We can't check the actual text since we could
   // be on the wrong thread and don't know if we're in the plugin or the host.
   if (desc.face.type != PP_VARTYPE_STRING &&
       desc.face.type != PP_VARTYPE_UNDEFINED)
     return false;
 
   // Check enum ranges.
   if (static_cast<int>(desc.family) < PP_FONTFAMILY_DEFAULT ||
       static_cast<int>(desc.family) > PP_FONTFAMILY_MONOSPACE)
     return false;
   if (static_cast<int>(desc.weight) < PP_FONTWEIGHT_100 ||
       static_cast<int>(desc.weight) > PP_FONTWEIGHT_900)
     return false;
 
   // Check for excessive sizes which may cause layout to get confused.
   if (desc.size > 200)
     return false;
 
   return true;
 }
 
 }  // namespace ppapi