linux: build a fake libxul and libxpcom

base/native_library_linux.cc

Index: base/native_library_linux.cc
diff --git a/base/native_library_linux.cc b/base/native_library_linux.cc
index 2e5db88633981114cbddc78744263cbaff98b785..05050bdcf036d4f08a6d857a16cfca8929e125c4 100644
--- a/base/native_library_linux.cc
+++ b/base/native_library_linux.cc
@@ -16,14 +16,8 @@ namespace base {
 NativeLibrary LoadNativeLibrary(const FilePath& library_path) {
   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;
-    }
+    LOG(ERROR) << "dlopen failed when trying to open " << library_path.value()
+               << ": " << dlerror();
   }
 
   return dl;