Revert of Link to DirectWrite directly, instead of calling LoadLibrary

content/child/dwrite_font_proxy/font_fallback_win_unittest.cc

 // Copyright 2016 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 "content/child/dwrite_font_proxy/font_fallback_win.h"
 
 #include <dwrite.h>
 #include <shlobj.h>
 #include <wrl.h>
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "content/child/dwrite_font_proxy/dwrite_font_proxy_win.h"
 #include "content/test/dwrite_font_fake_sender_win.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/win/text_analysis_source.h"
 
 namespace mswr = Microsoft::WRL;
 
 namespace content {
 
 namespace {
 
 class FontFallbackUnitTest : public testing::Test {
  public:
   FontFallbackUnitTest() {
-    DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory),
-                        &factory_);
+    CreateDWriteFactory(&factory_);
 
     factory_->CreateNumberSubstitution(DWRITE_NUMBER_SUBSTITUTION_METHOD_NONE,
                                        L"en-us", true /* ignoreUserOverride */,
                                        &number_substitution_);
 
     std::vector<base::char16> font_path;
     font_path.resize(MAX_PATH);
     SHGetSpecialFolderPath(nullptr /* hwndOwner - reserved */, font_path.data(),
                            CSIDL_FONTS, FALSE /* fCreate*/);
     base::string16 segoe_path;
     segoe_path.append(font_path.data()).append(L"\\seguisym.ttf");
 
     fake_collection_ = new FakeFontCollection();
     fake_collection_->AddFont(L"Segoe UI Symbol")
         .AddFamilyName(L"en-us", L"Segoe UI Symbol")
         .AddFilePath(segoe_path);
 
     mswr::MakeAndInitialize<DWriteFontCollectionProxy>(
         &collection_, factory_.Get(), fake_collection_->GetSender());
   }
 
+  void CreateDWriteFactory(IUnknown** 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"));
+    if (!dwrite_create_factory_proc)
+      return;
+
+    dwrite_create_factory_proc(DWRITE_FACTORY_TYPE_SHARED,
+                               __uuidof(IDWriteFactory), factory);
+  }
+
   scoped_refptr<FakeFontCollection> fake_collection_;
   mswr::ComPtr<IDWriteFactory> factory_;
   mswr::ComPtr<DWriteFontCollectionProxy> collection_;
   mswr::ComPtr<IDWriteNumberSubstitution> number_substitution_;
 };
 
 TEST_F(FontFallbackUnitTest, MapCharacters) {
   mswr::ComPtr<FontFallback> fallback;
   mswr::MakeAndInitialize<FontFallback>(&fallback, collection_.Get(),
                                         fake_collection_->GetSender());
@@ skipping 121 matching lines @@
                           DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STYLE_NORMAL,
                           DWRITE_FONT_STRETCH_NORMAL, &mapped_length, &font,
                           &scale);
 
   EXPECT_EQ(1u, fake_collection_->MessageCount());
   EXPECT_EQ(2u, mapped_length);
 }
 
 }  // namespace
 }  // namespace content