Remove the use of d3dcompiler_43.dll.

ui/gl/gl_implementation_win.cc

 // Copyright (c) 2012 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.
 
 #include <vector>
 
 #include "base/at_exit.h"
 #include "base/base_paths.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 15 matching lines @@
 #include "ui/gl/gl_wgl_api_implementation.h"
 
 #if defined(ENABLE_SWIFTSHADER)
 #include "software_renderer.h"
 #endif
 
 namespace gfx {
 
 namespace {
 
-// Version 43 is the latest version of D3DCompiler_nn.dll that works prior to
-// Windows Vista.
-const wchar_t kPreVistaD3DCompiler[] = L"D3DCompiler_43.dll";
-const wchar_t kPostVistaD3DCompiler[] = L"D3DCompiler_46.dll";
+const wchar_t kD3DCompiler[] = L"D3DCompiler_46.dll";
 
 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
   glClearDepthf(static_cast<GLclampf>(depth));
 }
 
 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
                                                     GLclampd z_far) {
   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
 }
 
@@ skipping 104 matching lines @@
       break;
     }
     case kGLImplementationEGLGLES2: {
       base::FilePath module_path;
       if (!PathService::Get(base::DIR_MODULE, &module_path))
         return false;
 
       // Attempt to load the D3DX shader compiler using the default search path
       // and if that fails, using an absolute path. This is to ensure these DLLs
       // are loaded before ANGLE is loaded in case they are not in the default
-      // search path. Prefer the post vista version.
-      if (base::win::GetVersion() < base::win::VERSION_VISTA ||
-          !LoadD3DXLibrary(module_path, kPostVistaD3DCompiler)) {
-        LoadD3DXLibrary(module_path, kPreVistaD3DCompiler);
-      }
+      // search path.
+      LoadD3DXLibrary(module_path, kD3DCompiler);
 
       base::FilePath gles_path;
       const CommandLine* command_line = CommandLine::ForCurrentProcess();
       bool using_swift_shader =
           command_line->GetSwitchValueASCII(switches::kUseGL) == "swiftshader";
       if (using_swift_shader) {
         if (!command_line->HasSwitch(switches::kSwiftShaderPath))
           return false;
         gles_path =
             command_line->GetSwitchValuePath(switches::kSwiftShaderPath);
@@ skipping 194 matching lines @@
     case kGLImplementationDesktopGL:
       return GetGLWindowSystemBindingInfoWGL(info);
     case kGLImplementationEGLGLES2:
       return GetGLWindowSystemBindingInfoEGL(info);
     default:
       return false;
   }
 }
 
 }  // namespace gfx