Remove use of appenginevm build tag.

Managed VM apps can use the net/http package directly, and can use the metadata server instead of the appengine package to get Service Account tokens. Change-Id: Ifa30eea446ffe4a9121ce3401900f4b73ddf07db Reviewed-on: https://go-review.googlesource.com/14125 Reviewed-by: Andrew Gerrand <adg@golang.org>

Author: broady

client_appengine.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build appengine appenginevm
+// +build appengine
 
 // App Engine hooks.
 

google/appengine_hook.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build appengine appenginevm
+// +build appengine
 
 package google