Remove WebFont.MissedCache.DownloadTime.*

Remove unused WebFont related metrics,
WebFont.MissedCache.DownloadTime.*.

Bug: 1156195
Change-Id: Ic26e5479737534167aeaf85f1c94e302dcadb00a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592229Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Auto-Submit: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845061}

third_party/blink/renderer/core/css/remote_font_face_source.cc

@@ -468,51 +468,27 @@ void RemoteFontFaceSource::FontLoadHistograms::RecordLoadTimeHistogram(
   // bucket.
   if (font->ErrorOccurred()) {
     base::UmaHistogramTimes("WebFont.DownloadTime.LoadError", delta);
-    if (data_source_ == kFromNetwork) {
-      base::UmaHistogramTimes("WebFont.MissedCache.DownloadTime.LoadError",
-                              delta);
-    }
     return;
   }
 
   size_t size = font->EncodedSize();
   if (size < 10 * 1024) {
     base::UmaHistogramTimes("WebFont.DownloadTime.0.Under10KB", delta);
-    if (data_source_ == kFromNetwork) {
-      base::UmaHistogramTimes("WebFont.MissedCache.DownloadTime.0.Under10KB",
-                              delta);
-    }
     return;
   }
   if (size < 50 * 1024) {
     base::UmaHistogramTimes("WebFont.DownloadTime.1.10KBTo50KB", delta);
-    if (data_source_ == kFromNetwork) {
-      base::UmaHistogramTimes("WebFont.MissedCache.DownloadTime.1.10KBTo50KB",
-                              delta);
-    }
     return;
   }
   if (size < 100 * 1024) {
     base::UmaHistogramTimes("WebFont.DownloadTime.2.50KBTo100KB", delta);
-    if (data_source_ == kFromNetwork) {
-      base::UmaHistogramTimes("WebFont.MissedCache.DownloadTime.2.50KBTo100KB",
-                              delta);
-    }
     return;
   }
   if (size < 1024 * 1024) {
     base::UmaHistogramTimes("WebFont.DownloadTime.3.100KBTo1MB", delta);
-    if (data_source_ == kFromNetwork) {
-      base::UmaHistogramTimes("WebFont.MissedCache.DownloadTime.3.100KBTo1MB",
-                              delta);
-    }
     return;
   }
   base::UmaHistogramTimes("WebFont.DownloadTime.4.Over1MB", delta);
-  if (data_source_ == kFromNetwork) {
-    base::UmaHistogramTimes("WebFont.MissedCache.DownloadTime.4.Over1MB",
-                            delta);
-  }
 }
 
 RemoteFontFaceSource::FontLoadHistograms::CacheHitMetrics

tools/metrics/histograms/histograms_xml/histogram_suffixes_list.xml

@@ -19664,7 +19664,11 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram_suffixes name="WebFontMissedCache" separator="." ordering="prefix">
   <owner>toyoshim@chromium.org</owner>
-  <suffix name="MissedCache" label="On missed cache"/>
+  <suffix name="MissedCache" label="On missed cache">
+    <obsolete>
+      Removed Dec 2020.
+    </obsolete>
+  </suffix>
   <affected-histogram name="WebFont.DownloadTime.0.Under10KB"/>
   <affected-histogram name="WebFont.DownloadTime.1.10KBTo50KB"/>
   <affected-histogram name="WebFont.DownloadTime.2.50KBTo100KB"/>