Fix compile failures in Chrome OS and Views builds.

chrome/browser/renderer_host/render_crash_handler_host_linux.cc

Index: chrome/browser/renderer_host/render_crash_handler_host_linux.cc
===================================================================
--- chrome/browser/renderer_host/render_crash_handler_host_linux.cc	(revision 30162)
+++ chrome/browser/renderer_host/render_crash_handler_host_linux.cc	(working copy)
@@ -174,9 +174,9 @@
   renderer_socket_ = fds[0];
   browser_socket_ = fds[1];
 
-  MessageLoop* ml = ChromeThread::GetMessageLoop(ChromeThread::IO);
-  ml->PostTask(FROM_HERE, NewRunnableMethod(
-        this, &RenderCrashHandlerHostLinux::Init));
+  ChromeThread::PostTask(
+      ChromeThread::IO, FROM_HERE,
+      NewRunnableMethod(this, &RenderCrashHandlerHostLinux::Init));
 }
 
 RenderCrashHandlerHostLinux::~RenderCrashHandlerHostLinux() {