Files App: Remove unused metrics FileBrowser.Load.*.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index ec05b11180d18f342f1573bedd6639e48593e14d..d91aab601dafda0c9826770cc0d219d4da47f5a2 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -110018,13 +110018,32 @@ value.
 
 <histogram_suffixes name="FileBrowserLoad" separator=".">
   <suffix name="Construct"
-      label="Time spent constructing the main Javascript object."/>
-  <suffix name="DOM" label="Time to initialize DOM."/>
+      label="Time spent constructing the main Javascript object.">
+    <obsolete>
+      Deprecated as of 12/2016.
+    </obsolete>
+  </suffix>
+  <suffix name="DOM" label="Time to initialize DOM.">
+    <obsolete>
+      Deprecated as of 12/2016.
+    </obsolete>
+  </suffix>
   <suffix name="FileSystem"
-      label="Deprecated as of 9/2013. Time to get access to the local file
-             system."/>
-  <suffix name="Parse" label="Time to parse Javascript and CSS (Deprecated)."/>
-  <suffix name="Roots" label="Time to enumerate file system roots."/>
+      label="Time to get access to the local file system.">
+    <obsolete>
+      Deprecated as of 9/2013.
+    </obsolete>
+  </suffix>
+  <suffix name="Parse" label="Time to parse Javascript and CSS (Deprecated).">
+    <obsolete>
+      Deprecated as of 12/2016.
+    </obsolete>
+  </suffix>
+  <suffix name="Roots" label="Time to enumerate file system roots.">
+    <obsolete>
+      Deprecated as of 12/2016.
+    </obsolete>
+  </suffix>
   <suffix name="Total"
       label="Total load time from the moment the Javascript started parsing
              till the moment the empty file list is displayed."/>