oauth2: avoid using http.DefaultTransport

google/google.go

Index: google/google.go 
diff --git a/google/google.go b/google/google.go 
index fec36de445d535ddd25179029849072033d3b933..f83d24609005301f1e32db1740060c7a3384ce9a 100644 
--- a/google/google.go 
+++ b/google/google.go 
@@ -61,7 +61,7 @@ func NewComputeEngineConfig(account string) *ComputeEngineConfig { 
 
 // NewTransport creates an authorized transport. 
 func (c *ComputeEngineConfig) NewTransport() oauth2.Transport { 
-	return oauth2.NewAuthorizedTransport(c, nil) 
+	return oauth2.NewAuthorizedTransport(http.DefaultTransport, c, nil) 
 } 
 
 // FetchToken retrieves a new access token via metadata server. 
@@ -76,7 +76,7 @@ func (c *ComputeEngineConfig) FetchToken(existing *oauth2.Token) (token *oauth2. 
	return 
	} 
	req.Header.Add("X-Google-Metadata-Request", "True") 
-	resp, err := (&http.Client{Transport: oauth2.DefaultTransport}).Do(req) 
+	resp, err := http.DefaultClient.Do(req) 
	if err != nil { 
	return 
	}