Don't reenter Webkit, while it waits for outgoing sync calls to complete. Thi...

chrome/browser/browser_accessibility_manager.cc

Index: chrome/browser/browser_accessibility_manager.cc
===================================================================
--- chrome/browser/browser_accessibility_manager.cc	(revision 5826)
+++ chrome/browser/browser_accessibility_manager.cc	(working copy)
@@ -108,6 +108,10 @@
       members->render_widget_host_->process()->channel()) {
     // Necessary for the send to keep the UI responsive.
     msg->EnableMessagePumping();
+    // By default sync calls are unblocking, i.e if the receiver is an outgoing
+    // sync call, it will process received sync calls. Webkit is not reentrant.
+    // We don't want to reenter Webkit if it is in an outgoing sync call.
+    msg->set_unblock(false);
     success = members->render_widget_host_->process()->channel()->
         SendWithTimeout(msg, kAccessibilityMessageTimeOut);
   }