clang/win: Fix most -Wunused-function warnings in Chromium code.

gpu/config/gpu_info_collector_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 "gpu/config/gpu_info_collector.h"
 
 // This has to be included before windows.h.
 #include "third_party/re2/re2/re2.h"
 
 #include <windows.h>
@@ skipping 33 matching lines @@
 namespace {
 
 // This must be kept in sync with histograms.xml.
 enum DisplayLinkInstallationStatus {
   DISPLAY_LINK_NOT_INSTALLED,
   DISPLAY_LINK_7_1_OR_EARLIER,
   DISPLAY_LINK_7_2_OR_LATER,
   DISPLAY_LINK_INSTALLATION_STATUS_MAX
 };
 
-float ReadXMLFloatValue(XmlReader* reader) {
-  std::string score_string;
-  if (!reader->ReadElementContent(&score_string))
-    return 0.0;
-
-  double score;
-  if (!base::StringToDouble(score_string, &score))
-    return 0.0;
-
-  return static_cast<float>(score);
-}
-
 // Returns the display link driver version or an invalid version if it is
 // not installed.
 Version DisplayLinkVersion() {
   base::win::RegKey key;
 
   if (key.Open(HKEY_LOCAL_MACHINE, L"SOFTWARE", KEY_READ | KEY_WOW64_64KEY))
     return Version();
 
   if (key.OpenKey(L"DisplayLink", KEY_READ | KEY_WOW64_64KEY))
     return Version();
@@ skipping 429 matching lines @@
   }
 
   MergeGPUInfoGL(basic_gpu_info, context_gpu_info);
 
   basic_gpu_info->dx_diagnostics_info_state =
       context_gpu_info.dx_diagnostics_info_state;
   basic_gpu_info->dx_diagnostics = context_gpu_info.dx_diagnostics;
 }
 
 }  // namespace gpu