linux: don't always print dlopen errors from LoadNativeLibrary

base/native_library_linux.cc

 // Copyright (c) 2010 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/native_library.h"
 
 #include <dlfcn.h>
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 
 namespace base {
 
 // static
-NativeLibrary LoadNativeLibrary(const FilePath& library_path) {
+NativeLibrary LoadNativeLibrary(const FilePath& library_path,
+                                std::string* error) {
   // dlopen() opens the file off disk.
   base::ThreadRestrictions::AssertIOAllowed();
 
   // We deliberately do not use RTLD_DEEPBIND.  For the history why, please
   // refer to the bug tracker.  Some useful bug reports to read include:
   // http://crbug.com/17943, http://crbug.com/17557, http://crbug.com/36892,
   // and http://crbug.com/40794.
   void* dl = dlopen(library_path.value().c_str(), RTLD_LAZY);
-  if (!dl) {
-    std::string error_message = dlerror();
-    // Some obsolete plugins depend on libxul or libxpcom.
-    // Ignore the error messages when failing to load these.
-    if (error_message.find("libxul.so") == std::string::npos &&
-        error_message.find("libxpcom.so") == std::string::npos) {
-      LOG(ERROR) << "dlopen failed when trying to open " << library_path.value()
-                 << ": " << error_message;
-    }
-  }
+  if (!dl && error)
+    *error = dlerror();
 
   return dl;
 }
 
 // static
 void UnloadNativeLibrary(NativeLibrary library) {
   int ret = dlclose(library);
   if (ret < 0) {
     LOG(ERROR) << "dlclose failed: " << dlerror();
     NOTREACHED();
   }
 }
 
 // static
 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
                                           const char* name) {
   return dlsym(library, name);
 }
 
 // static
 string16 GetNativeLibraryName(const string16& name) {
   return ASCIIToUTF16("lib") + name + ASCIIToUTF16(".so");
 }
 
 }  // namespace base