go/internal/gcimporter: rename from go/gcimporter15

Follow through on promise to remove the old API.

Change-Id: If1f5addfeb1b82acc5a1730474e2f06102dbb615
Reviewed-on: https://go-review.googlesource.com/105977
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>

go/gcexportdata/gcexportdata.go

@@ -7,9 +7,6 @@
 // gc compiler.  This package supports go1.7 export data format and all
 // later versions.
 //
-// This package replaces the deprecated golang.org/x/tools/go/gcimporter15
-// package, which will be deleted in October 2017.
-//
 // Although it might seem convenient for this package to live alongside
 // go/types in the standard library, this would cause version skew
 // problems for developer tools that use it, since they must be able to
@@ -32,7 +29,7 @@ import (
 	"io"
 	"io/ioutil"
 
-	gcimporter "golang.org/x/tools/go/gcimporter15"
+	"golang.org/x/tools/go/internal/gcimporter"
 )
 
 // Find returns the name of an object (.o) or archive (.a) file

go/internal/gcimporter/bexport19_test.go

@@ -13,7 +13,7 @@ import (
 	"go/types"
 	"testing"
 
-	gcimporter "golang.org/x/tools/go/gcimporter15"
+	"golang.org/x/tools/go/internal/gcimporter"
 )
 
 const src = `

go/internal/gcimporter/bexport_test.go

@@ -18,7 +18,7 @@ import (
 	"testing"
 
 	"golang.org/x/tools/go/buildutil"
-	gcimporter "golang.org/x/tools/go/gcimporter15"
+	"golang.org/x/tools/go/internal/gcimporter"
 	"golang.org/x/tools/go/loader"
 )
 

go/internal/gcimporter/gcimporter.go

@@ -6,14 +6,10 @@
 // but it also contains the original source-based importer code for Go1.6.
 // Once we stop supporting 1.6, we can remove that code.
 
-// Package gcimporter15 provides various functions for reading
+// Package gcimporter provides various functions for reading
 // gc-generated object files that can be used to implement the
 // Importer interface defined by the Go 1.5 standard library package.
-//
-// Deprecated: this package will be deleted in October 2017.
-// New code should use golang.org/x/tools/go/gcexportdata.
-//
-package gcimporter // import "golang.org/x/tools/go/gcimporter15"
+package gcimporter // import "golang.org/x/tools/go/internal/gcimporter"
 
 import (
 	"bufio"