Linux: fix a bunch of NULL vs. 0 issues spotted by gcc 4.5.

chrome/browser/ppapi_plugin_process_host.cc

Index: chrome/browser/ppapi_plugin_process_host.cc
diff --git a/chrome/browser/ppapi_plugin_process_host.cc b/chrome/browser/ppapi_plugin_process_host.cc
index c90d1f4eda982bce7bfb8968c6e73db520b33444..225cc80ed1475393ea0553c2b998eea1d7c729b6 100644
--- a/chrome/browser/ppapi_plugin_process_host.cc
+++ b/chrome/browser/ppapi_plugin_process_host.cc
@@ -28,7 +28,7 @@ void PpapiPluginProcessHost::Init(const FilePath& path,
   reply_msg_.reset(reply_msg);
 
   if (!CreateChannel()) {
-    ReplyToRenderer(NULL, IPC::ChannelHandle());
+    ReplyToRenderer(base::kNullProcessHandle, IPC::ChannelHandle());
     return;
   }
 
@@ -38,7 +38,7 @@ void PpapiPluginProcessHost::Init(const FilePath& path,
 
   FilePath exe_path = ChildProcessHost::GetChildPath(plugin_launcher.empty());
   if (exe_path.empty()) {
-    ReplyToRenderer(NULL, IPC::ChannelHandle());
+    ReplyToRenderer(base::kNullProcessHandle, IPC::ChannelHandle());
     return;
   }
 
@@ -92,13 +92,13 @@ void PpapiPluginProcessHost::OnChannelConnected(int32 peer_pid) {
   PpapiMsg_LoadPlugin* msg = new PpapiMsg_LoadPlugin(
       plugins_renderer_handle, plugin_path_, filter_->render_process_id());
   if (!Send(msg))  // Just send an empty handle on failure.
-    ReplyToRenderer(NULL, IPC::ChannelHandle());
+    ReplyToRenderer(base::kNullProcessHandle, IPC::ChannelHandle());
   // This function will result in OnChannelCreated getting called to finish.
 }
 
 void PpapiPluginProcessHost::OnChannelError() {
   if (reply_msg_.get())
-    ReplyToRenderer(NULL, IPC::ChannelHandle());
+    ReplyToRenderer(base::kNullProcessHandle, IPC::ChannelHandle());
 }
 
 void PpapiPluginProcessHost::OnPluginLoaded(