Do not use extern template declarations for RectBase etc for NaCl builds

ui/gfx/geometry/insets_f.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_GFX_GEOMETRY_INSETS_F_H_
 #define UI_GFX_GEOMETRY_INSETS_F_H_
 
 #include <string>
 
 #include "build/build_config.h"
 #include "ui/gfx/geometry/insets_base.h"
 #include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
 // A floating versin of gfx::Insets.
 class GFX_EXPORT InsetsF : public InsetsBase<InsetsF, float> {
  public:
   InsetsF();
   InsetsF(float top, float left, float bottom, float right);
   ~InsetsF();
 
   // Returns a string representation of the insets.
   std::string ToString() const;
 };
 
-#if !defined(COMPILER_MSVC)
+#if !defined(COMPILER_MSVC) && !defined(__native_client__)
 extern template class InsetsBase<InsetsF, float>;
 #endif
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_INSETS_F_H_