Fixed stack overflow if wglGetExtensionsStringARB is not available....

app/gfx/gl/gl_context_win.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file implements the NativeViewGLContext and PbufferGLContext classes.
 
 #include "app/gfx/gl/gl_context.h"
 
 #include <GL/osmesa.h>
 
@@ skipping 315 matching lines @@
 
 
 std::string BaseWinGLContext::GetExtensions() {
   if (wglGetExtensionsStringARB) {
     const char* extensions = wglGetExtensionsStringARB(GetDC());
     if (extensions) {
       return GLContext::GetExtensions() + " " + extensions;
     }
   }
 
-  return GetExtensions();
+  return GLContext::GetExtensions();
 }
 
 bool NativeViewGLContext::Initialize(bool multisampled) {
   // The GL context will render to this window.
   device_context_ = ::GetDC(window_);
 
   int pixel_format =
       multisampled ? g_multisampled_pixel_format : g_regular_pixel_format;
   if (!SetPixelFormat(device_context_,
                       pixel_format,
@@ skipping 382 matching lines @@
     }
     case kGLImplementationMockGL:
       return new StubGLContext;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 }  // namespace gfx