[NoStatePrefetch] Remove obsolete histograms

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 0f2cf42fff30c20b3ce732c7a31f96ab04774816..042160ad6a3630881967f1b90f0fc135383fec33 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -49812,16 +49812,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="Prerender.NoStatePrefetchTTFCP" units="ms">
-  <obsolete>
-    Deprecated December 28, 2016, use Prerender.PrefetchTTFCP instead.
-  </obsolete>
-  <owner>droger@chromium.org</owner>
-  <owner>mattcary@chromium.org</owner>
-  <owner>pasko@chromium.org</owner>
-  <summary>Time to first contentful paint.</summary>
-</histogram>
-
 <histogram name="Prerender.OmniboxNavigationsCouldPrerender">
   <owner>pasko@chromium.org</owner>
   <summary>
@@ -114906,16 +114896,12 @@ value.
       label="No prefetch. Warning: do not compare with the load times of
              prefetched pages (bias)."/>
   <suffix name="Warm" label="Prefetch skips revalidation."/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP"/>
   <affected-histogram name="Prerender.PrefetchTTFCP"/>
 </histogram_suffixes>
 
 <histogram_suffixes name="PrerenderPrefetchMainResourceType" separator=".">
   <suffix name="Cacheable" label="Main resource cacheable."/>
   <suffix name="NoStore" label="Main resource no-store."/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Cold"/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Reference"/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Warm"/>
   <affected-histogram name="Prerender.PrefetchTTFCP.Cold"/>
   <affected-histogram name="Prerender.PrefetchTTFCP.Reference"/>
   <affected-histogram name="Prerender.PrefetchTTFCP.Warm"/>
@@ -114964,13 +114950,6 @@ value.
   <affected-histogram name="Prerender.NoStatePrefetchMainResourceRedirects"/>
   <affected-histogram name="Prerender.NoStatePrefetchResponseTypes"/>
   <affected-histogram name="Prerender.NoStatePrefetchSubResourceRedirects"/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Cold.Cacheable"/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Cold.NoStore"/>
-  <affected-histogram
-      name="Prerender.NoStatePrefetchTTFCP.Reference.Cacheable"/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Reference.NoStore"/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Warm.Cacheable"/>
-  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Warm.NoStore"/>
   <affected-histogram name="Prerender.PageVisitedStatus"/>
   <affected-histogram name="Prerender.PerceivedPLT"/>
   <affected-histogram name="Prerender.PerceivedPLTFirstAfterMiss"/>