Move GrGLExtensions from GrGLContextInfo to GrGLInterface

src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp

Index: src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp
diff --git a/src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp b/src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp
index 81f080ea67cbd56fd4b0c985cd774ed9e7977449..e011605edff27e106a2b063112f6ec21fc55b1b3 100644
--- a/src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp
+++ b/src/gpu/gl/win/GrGLCreateNativeInterface_win.cpp
@@ -6,8 +6,6 @@
  * found in the LICENSE file.
  */
 
-
-#include "gl/GrGLExtensions.h"
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLUtil.h"
 #define WIN32_LEAN_AND_MEAN
@@ -308,6 +306,7 @@ const GrGLInterface* GrGLCreateNativeInterface() {
         }
 
         interface->fStandard = kGL_GrGLStandard;
+        interface->fExtensions.swap(&extensions);
 
         return interface;
     } else {