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

gpu/config/gpu_info_collector_win.cc

Index: gpu/config/gpu_info_collector_win.cc
diff --git a/gpu/config/gpu_info_collector_win.cc b/gpu/config/gpu_info_collector_win.cc
index cc935ea9b87ead159d68cf58b5c66ae46943a305..f51764da823fb50542f6e6ccdc03fbbca6bce0e3 100644
--- a/gpu/config/gpu_info_collector_win.cc
+++ b/gpu/config/gpu_info_collector_win.cc
@@ -51,18 +51,6 @@ enum DisplayLinkInstallationStatus {
   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() {