Cleanup trace events from fallback font on Windows

Remove code that was used to debug font fallback.

Change-Id: I65c04b1dd7167b5b2a9204bb7f2d7a7d70773cfe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470460Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817088}

ui/gfx/font_fallback_win.cc

@@ -72,7 +72,6 @@ void AppendFont(const std::string& name, int size, std::vector<Font>* fonts) {
 void QueryLinkedFontsFromRegistry(const Font& font,
                                   std::map<std::string, std::string>* font_map,
                                   std::vector<Font>* linked_fonts) {
-  std::string logging_str;
   const wchar_t* kSystemLink =
       L"Software\\Microsoft\\Windows NT\\CurrentVersion\\FontLink\\SystemLink";
 
@@ -87,18 +86,12 @@ void QueryLinkedFontsFromRegistry(const Font& font,
     return;
   }
 
-  base::StringAppendF(&logging_str, "Original font: %s\n",
-                      font.GetFontName().c_str());
-
   std::string filename;
   std::string font_name;
   for (size_t i = 0; i < values.size(); ++i) {
     internal::ParseFontLinkEntry(
         base::WideToUTF8(values[i]), &filename, &font_name);
 
-    base::StringAppendF(&logging_str, "fallback: '%s' '%s'\n",
-                        font_name.c_str(), filename.c_str());
-
     // If the font name is present, add that directly, otherwise add the
     // font names corresponding to the filename.
     if (!font_name.empty()) {
@@ -112,13 +105,6 @@ void QueryLinkedFontsFromRegistry(const Font& font,
   }
 
   key.Close();
-
-  for (const auto& resolved_font : *linked_fonts) {
-    base::StringAppendF(&logging_str, "resolved: '%s'\n",
-                        resolved_font.GetFontName().c_str());
-  }
-
-  TRACE_EVENT1("fonts", "QueryLinkedFontsFromRegistry", "results", logging_str);
 }
 
 // CachedFontLinkSettings is a singleton cache of the Windows font settings
@@ -163,9 +149,6 @@ const std::vector<Font>* CachedFontLinkSettings::GetLinkedFonts(
   if (it != cached_linked_fonts_.end())
     return &it->second;
 
-  TRACE_EVENT1("fonts", "CachedFontLinkSettings::GetLinkedFonts", "font_name",
-               font_name);
-
   SCOPED_UMA_HISTOGRAM_LONG_TIMER(
       "FontFallback.GetLinkedFonts.CacheMissTiming");
   std::vector<Font>* linked_fonts = &cached_linked_fonts_[font_name];