linux: don't always print dlopen errors from LoadNativeLibrary

chrome/common/pepper_plugin_registry.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 "chrome/common/pepper_plugin_registry.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/native_library.h"
 #include "base/path_service.h"
@@ skipping 261 matching lines @@
   ComputeBuiltInPlugins(plugins);
   ComputePluginsFromCommandLine(plugins);
 }
 
 // static
 void PepperPluginRegistry::PreloadModules() {
   std::vector<PepperPluginInfo> plugins;
   ComputeList(&plugins);
   for (size_t i = 0; i < plugins.size(); ++i) {
     if (!plugins[i].is_internal) {
-      base::NativeLibrary library = base::LoadNativeLibrary(plugins[i].path);
+      std::string error;
+      base::NativeLibrary library = base::LoadNativeLibrary(plugins[i].path,
+                                                            &error);
       LOG_IF(WARNING, !library) << "Unable to load plugin "
-                                << plugins[i].path.value();
+                                << plugins[i].path.value() << " "
+                                << error;
     }
   }
 }
 
 const PepperPluginInfo* PepperPluginRegistry::GetInfoForPlugin(
     const FilePath& path) const {
   for (size_t i = 0; i < plugin_list_.size(); ++i) {
     if (path == plugin_list_[i].path)
       return &plugin_list_[i];
   }
@@ skipping 129 matching lines @@
 
 PepperPluginRegistry::NaClModuleInfoList::iterator
     PepperPluginRegistry::FindNaClModule(const GURL& url) {
   for (NaClModuleInfoList::iterator iter = nacl_module_list_.begin();
        iter != nacl_module_list_.end(); ++iter) {
     if (iter->url == url)
       return iter;
   }
   return nacl_module_list_.end();
 }