Set vmstats socket as blocking.

runtime/bin/vmstats_impl.cc

Index: runtime/bin/vmstats_impl.cc
===================================================================
--- runtime/bin/vmstats_impl.cc	(revision 19343)
+++ runtime/bin/vmstats_impl.cc	(working copy)
@@ -149,6 +149,7 @@
       // Stop() closed the socket.
       return;
     }
+    Socket::SetBlocking(socket);
 
     // TODO(tball): rewrite this to use STL, so as to eliminate the static
     // buffer and support resource URLs that are longer than BUFSIZE.
@@ -160,10 +161,6 @@
       // Invalid HTTP request, ignore.
       continue;
     }
-    intptr_t n;
-    while ((n = Socket::Read(socket, buffer + len, BUFSIZE - len)) > 0) {
-      len += n;
-    }
     buffer[len] = '\0';
 
     // Verify it's a GET request.