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

ui/gfx/geometry/rect.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.
 
 // Defines a simple integer rectangle class.  The containment semantics
 // are array-like; that is, the coordinate (x, y) is considered to be
 // contained by the rectangle, but the coordinate (x + width, y) is not.
 // The class will happily let you create malformed rectangles (that is,
 // rectangles with negative width and/or height), but there will be assertions
 // in the operations (such as Contains()) to complain in this case.
@@ skipping 113 matching lines @@
   int y = std::ceil(rect.y() * y_scale);
   int r = rect.width() == 0 ? x : std::floor(rect.right() * x_scale);
   int b = rect.height() == 0 ? y : std::floor(rect.bottom() * y_scale);
   return Rect(x, y, r - x, b - y);
 }
 
 inline Rect ScaleToEnclosedRect(const Rect& rect, float scale) {
   return ScaleToEnclosedRect(rect, scale, scale);
 }
 
-#if !defined(COMPILER_MSVC)
+#if !defined(COMPILER_MSVC) && !defined(__native_client__)
 extern template class RectBase<Rect, Point, Size, Insets, Vector2d, int>;
 #endif
 
 // This is declared here for use in gtest-based unit tests but is defined in
 // the gfx_test_support target. Depend on that to use this in your unit test.
 // This should not be used in production code - call ToString() instead.
 void PrintTo(const Rect& rect, ::std::ostream* os);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_RECT_H_