[vpython] Fix PEP425 naming.

vpython/venv/venv.go

Index: vpython/venv/venv.go
diff --git a/vpython/venv/venv.go b/vpython/venv/venv.go
index 2e27fe8cf68483f84afd3de30eb7e56cbe73902a..0ff764e46035106023f7ce2184829ece1ceca5b7 100644
--- a/vpython/venv/venv.go
+++ b/vpython/venv/venv.go
@@ -566,7 +566,7 @@ func (e *Env) installVirtualEnv(c context.Context, pkgDir string) error {
 // getPEP425Tags calls Python's pip.pep425tags package to retrieve the tags.
 //
 // This must be run while "pip" is installed in the VirtualEnv.
-func (e *Env) getPEP425Tags(c context.Context) ([]*vpython.Pep425Tag, error) {
+func (e *Env) getPEP425Tags(c context.Context) ([]*vpython.PEP425Tag, error) {
 	// This script will return a list of 3-entry lists:
 	// [0]: version (e.g., "cp27")
 	// [1]: abi (e.g., "cp27mu", "none")
@@ -594,7 +594,7 @@ func (e *Env) getPEP425Tags(c context.Context) ([]*vpython.Pep425Tag, error) {
 			Err()
 	}
 
-	tags := make([]*vpython.Pep425Tag, len(tagEntries))
+	tags := make([]*vpython.PEP425Tag, len(tagEntries))
 	for i, te := range tagEntries {
 		if len(te) != 3 {
 			return nil, errors.Reason("invalid PEP425 tag entry: %(entry)v").
@@ -603,10 +603,10 @@ func (e *Env) getPEP425Tags(c context.Context) ([]*vpython.Pep425Tag, error) {
 				Err()
 		}
 
-		tags[i] = &vpython.Pep425Tag{
-			Version: te[0],
-			Abi:     te[1],
-			Arch:    te[2],
+		tags[i] = &vpython.PEP425Tag{
+			Python:   te[0],
+			Abi:      te[1],
+			Platform: te[2],
 		}
 	}