linux: don't always print dlopen errors from LoadNativeLibrary

ui/gfx/gl/gl_implementation_mac.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 "base/base_paths.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/native_library.h"
 #include "base/path_service.h"
 #include "ui/gfx/gl/gl_bindings.h"
@@ skipping 15 matching lines @@
   switch (implementation) {
     case kGLImplementationOSMesaGL: {
       FilePath module_path;
       if (!PathService::Get(base::DIR_MODULE, &module_path)) {
         LOG(ERROR) << "PathService::Get failed.";
         return false;
       }
 
       // When using OSMesa, just use OSMesaGetProcAddress to find entry points.
       base::NativeLibrary library = base::LoadNativeLibrary(
-          module_path.Append("osmesa.so"));
+          module_path.Append("osmesa.so"), NULL);
       if (!library) {
         VLOG(1) << "osmesa.so not found";
         return false;
       }
 
       GLGetProcAddressProc get_proc_address =
           reinterpret_cast<GLGetProcAddressProc>(
               base::GetFunctionPointerFromNativeLibrary(
                   library, "OSMesaGetProcAddress"));
       if (!get_proc_address) {
         LOG(ERROR) << "OSMesaGetProcAddress not found.";
         base::UnloadNativeLibrary(library);
         return false;
       }
 
       SetGLGetProcAddressProc(get_proc_address);
       AddGLNativeLibrary(library);
       SetGLImplementation(kGLImplementationOSMesaGL);
 
       InitializeGLBindingsGL();
       InitializeGLBindingsOSMESA();
       break;
     }
     case kGLImplementationDesktopGL: {
       base::NativeLibrary library = base::LoadNativeLibrary(
-          FilePath(kOpenGLFrameworkPath));
+          FilePath(kOpenGLFrameworkPath), NULL);
       if (!library) {
         LOG(ERROR) << "OpenGL framework not found";
         return false;
       }
 
       AddGLNativeLibrary(library);
       SetGLImplementation(kGLImplementationDesktopGL);
 
       InitializeGLBindingsGL();
       break;
@@ skipping 10 matching lines @@
 
   return true;
 }
 
 void InitializeDebugGLBindings() {
   InitializeDebugGLBindingsGL();
   InitializeDebugGLBindingsOSMESA();
 }
 
 }  // namespace gfx