Delete the font loading experiment code

content/child/dwrite_font_proxy/dwrite_font_proxy_win.cc

 // Copyright 2015 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/dwrite_font_proxy_win.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 24 matching lines @@
   LOAD_FAMILY_SUCCESS_MATCHED_FAMILY = 1,
   LOAD_FAMILY_ERROR_MULTIPLE_FAMILIES = 2,
   LOAD_FAMILY_ERROR_NO_FAMILIES = 3,
   LOAD_FAMILY_ERROR_NO_COLLECTION = 4,
 
   LOAD_FAMILY_MAX_VALUE
 };
 
 const char kFontKeyName[] = "font_key_name";
 
-const base::Feature kFileLoadingExperimentFeature{
-    "DirectWriteFontFileLoadingExperiment", base::FEATURE_DISABLED_BY_DEFAULT};
-
 void LogLoadFamilyResult(DirectWriteLoadFamilyResult result) {
   UMA_HISTOGRAM_ENUMERATION("DirectWrite.Fonts.Proxy.LoadFamilyResult", result,
                             LOAD_FAMILY_MAX_VALUE);
 }
 
 }  // namespace
 
 DWriteFontCollectionProxy::DWriteFontCollectionProxy() = default;
 
 DWriteFontCollectionProxy::~DWriteFontCollectionProxy() = default;
@@ skipping 422 matching lines @@
 FontFileEnumerator::FontFileEnumerator() = default;
 
 FontFileEnumerator::~FontFileEnumerator() = default;
 
 HRESULT FontFileEnumerator::GetCurrentFontFile(IDWriteFontFile** file) {
   DCHECK(file);
   if (current_file_ >= file_names_.size()) {
     return E_FAIL;
   }
 
-  if (base::FeatureList::IsEnabled(kFileLoadingExperimentFeature)) {
-    TRACE_EVENT0("dwrite",
-                 "FontFileEnumerator::GetCurrentFontFile (directwrite)");
-    HRESULT hr = factory_->CreateFontFileReference(
-        file_names_[current_file_].c_str(), nullptr /* lastWriteTime*/, file);
-    DCHECK(SUCCEEDED(hr));
-    return hr;
-  }
-
-  TRACE_EVENT0("dwrite", "FontFileEnumerator::GetCurrentFontFile (memmap)");
+  TRACE_EVENT0("dwrite", "FontFileEnumerator::GetCurrentFontFile");
   // CreateCustomFontFileReference ends up calling
   // DWriteFontCollectionProxy::CreateStreamFromKey.
   HRESULT hr = factory_->CreateCustomFontFileReference(
       reinterpret_cast<const void*>(file_names_[current_file_].c_str()),
       (file_names_[current_file_].length() + 1) * sizeof(base::char16),
       loader_.Get() /*IDWriteFontFileLoader*/, file);
   DCHECK(SUCCEEDED(hr));
   return hr;
 }
 
@@ skipping 53 matching lines @@
 
 HRESULT FontFileStream::RuntimeClassInitialize(
     const base::string16& file_name) {
   data_.Initialize(base::FilePath(file_name));
   if (!data_.IsValid())
     return E_FAIL;
   return S_OK;
 }
 
 }  // namespace content