Add exception in GlibLogHandler for atk-bridge warning

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 1762d79995c482269975164203244b9f2aa5185a..9e223dbc4dbf87799bf6f826adb3dbcc12d685fe 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -279,6 +279,8 @@ static void GLibLogHandler(const gchar* log_domain,
     LOG(ERROR) << message;
   } else if (strstr(message, "Theme parsing error")) {
     LOG(ERROR) << message;
+  } else if (strstr(message, "unknown signature")) {
+    LOG(ERROR) << message;
   } else {
     LOG(DFATAL) << log_domain << ": " << message;
   }