Remove obsolete from PurgeAndSuspend.Experimental.MemoryGrowth.* suffixes.

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 3c693441c30915f49c2b6f9cfb23b51caa01d1ae..c505d017790872daadbf1095126f122d6aa7d403 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -92915,47 +92915,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram_suffixes name="PurgeAndSuspendExperiment" separator=".">
   <suffix base="true" name="BlinkGCKB"
-      label="Constrained to the BlinkGC allocator">
-    <obsolete>
-      Derecated as of 05/2017. Replaced with BlinkGCKB.30min, 60min, and 90min
-      to investigate growth of BlinkGC memory usage more deeply.
-    </obsolete>
-  </suffix>
+      label="Constrained to the BlinkGC allocator"/>
   <suffix base="true" name="DiscardableKB"
-      label="Constrained to discardable memory usage">
-    <obsolete>
-      Derecated as of 05/2017. Replaced with DiscardableKB.30min, 60min, and
-      90min to investigate growth of discardable memory usage more deeply.
-    </obsolete>
-  </suffix>
+      label="Constrained to discardable memory usage"/>
   <suffix base="true" name="PartitionAllocKB"
-      label="Constrained to the ParitionAlloc allocator">
-    <obsolete>
-      Derecated as of 05/2017. Replaced with PartitionAllocKB.30min, 60min, and
-      90min to investigate growth of PartitionAlloc memory usage more deeply.
-    </obsolete>
-  </suffix>
-  <suffix base="true" name="MallocKB" label="Constrained to malloc usage">
-    <obsolete>
-      Derecated as of 05/2017. Replaced with MallocKB.30min, 60min, and 90min to
-      investigate growth of malloc memory usage more deeply.
-    </obsolete>
-  </suffix>
+      label="Constrained to the ParitionAlloc allocator"/>
+  <suffix base="true" name="MallocKB" label="Constrained to malloc usage"/>
   <suffix base="true" name="TotalAllocatedKB"
       label="Summed over the PartitionAlloc, malloc, discardable memory,
-             mainThreadIsolate() and BlinkGC allocators">
-    <obsolete>
-      Derecated as of 05/2017. Replaced with TotalAllocatedKB.30min, 60min, and
-      90min to investigate growth of renderer total memory usage more deeply.
-    </obsolete>
-  </suffix>
+             mainThreadIsolate() and BlinkGC allocators"/>
   <suffix base="true" name="V8MainThreadIsolateKB"
-      label="Constrained to memory usage by mainThreadIsolate()">
-    <obsolete>
-      Derecated as of 05/2017. Replaced with V8MainThreadIsolateKB.30min, 60min,
-      and 90min to investigate growth of v8 memory usage more deeply.
-    </obsolete>
-  </suffix>
+      label="Constrained to memory usage by mainThreadIsolate()"/>
   <affected-histogram name="PurgeAndSuspend.Experimental.MemoryGrowth"/>
 </histogram_suffixes>