Don't throw the thread name setting exception unless a debugger is attached.

base/platform_thread_win.cc

Index: base/platform_thread_win.cc
===================================================================
--- base/platform_thread_win.cc	(revision 2786)
+++ base/platform_thread_win.cc	(working copy)
@@ -48,6 +48,11 @@
 
 // static
 void PlatformThread::SetName(const char* name) {
+  // The debugger needs to be around to catch the name in the exception.  If
+  // there isn't a debugger, we are just needlessly throwing an exception.
+  if (!::IsDebuggerPresent())
+    return;
+
   THREADNAME_INFO info;
   info.dwType = 0x1000;
   info.szName = name;