Revert of Link to DirectWrite directly, instead of calling LoadLibrary

ui/gfx/win/direct_write.cc

 // Copyright 2014 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 "ui/gfx/win/direct_write.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/win/registry.h"
 #include "base/win/scoped_comptr.h"
 #include "base/win/windows_version.h"
 #include "skia/ext/fontmgr_default_win.h"
 #include "third_party/skia/include/ports/SkTypeface_win.h"
 #include "ui/gfx/platform_font_win.h"
 #include "ui/gfx/switches.h"
 
 namespace gfx {
 namespace win {
 
 void CreateDWriteFactory(IDWriteFactory** factory) {
+  using DWriteCreateFactoryProc = decltype(DWriteCreateFactory)*;
+  HMODULE dwrite_dll = LoadLibraryW(L"dwrite.dll");
+  if (!dwrite_dll)
+    return;
+
+  DWriteCreateFactoryProc dwrite_create_factory_proc =
+      reinterpret_cast<DWriteCreateFactoryProc>(
+          GetProcAddress(dwrite_dll, "DWriteCreateFactory"));
+  // Not finding the DWriteCreateFactory function indicates a corrupt dll.
+  if (!dwrite_create_factory_proc)
+    return;
+
+  // Failure to create the DirectWrite factory indicates a corrupt dll.
   base::win::ScopedComPtr<IUnknown> factory_unknown;
-  HRESULT hr =
-      DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory),
-                          factory_unknown.Receive());
-  if (FAILED(hr)) {
-    base::debug::Alias(&hr);
-    CHECK(false);
+  if (FAILED(dwrite_create_factory_proc(DWRITE_FACTORY_TYPE_SHARED,
+                                        __uuidof(IDWriteFactory),
+                                        factory_unknown.Receive()))) {
     return;
   }
   factory_unknown.QueryInterface<IDWriteFactory>(factory);
 }
 
 void MaybeInitializeDirectWrite() {
   static bool tried_dwrite_initialize = false;
   if (tried_dwrite_initialize)
     return;
   tried_dwrite_initialize = true;
@@ skipping 16 matching lines @@
   // (6.1.7600.*). We should just use GDI in these cases.
   SkFontMgr* direct_write_font_mgr = SkFontMgr_New_DirectWrite(factory.get());
   if (!direct_write_font_mgr)
     return;
   SetDefaultSkiaFactory(direct_write_font_mgr);
   gfx::PlatformFontWin::SetDirectWriteFactory(factory.get());
 }
 
 }  // namespace win
 }  // namespace gfx