linux: fix renderer/plugin crash when loading multiple pages with plugins

chrome/renderer/plugin_channel_host.cc

Index: chrome/renderer/plugin_channel_host.cc
diff --git a/chrome/renderer/plugin_channel_host.cc b/chrome/renderer/plugin_channel_host.cc
index e010c56c0d1e9ccbebc4d2905548d1bd12abfa63..0befaab49f526c62465d78b357a61556a5ecfde3 100644
--- a/chrome/renderer/plugin_channel_host.cc
+++ b/chrome/renderer/plugin_channel_host.cc
@@ -6,6 +6,10 @@
 
 #include "chrome/common/plugin_messages.h"
 
+#if defined(OS_POSIX)
+#include "chrome/common/ipc_channel_posix.h"
+#endif
+
 // A simple MessageFilter that will ignore all messages and respond to sync
 // messages with an error when is_listening_ is false.
 class IsListeningFilter : public IPC::ChannelProxy::MessageFilter {
@@ -76,6 +80,9 @@ PluginChannelHost::PluginChannelHost() {
 }
 
 PluginChannelHost::~PluginChannelHost() {
+#if defined(OS_POSIX)
+  IPC::RemoveAndCloseChannelSocket(channel_name());
+#endif
 }
 
 bool PluginChannelHost::Init(MessageLoop* ipc_message_loop,