Revert 247760 "Add UMA stats for ExtensionCache"

trunk/src/chrome/browser/extensions/updater/extension_cache_impl.cc

Index: trunk/src/chrome/browser/extensions/updater/extension_cache_impl.cc
===================================================================
--- trunk/src/chrome/browser/extensions/updater/extension_cache_impl.cc	(revision 247820)
+++ trunk/src/chrome/browser/extensions/updater/extension_cache_impl.cc	(working copy)
@@ -6,7 +6,6 @@
 
 #include "base/bind.h"
 #include "base/memory/singleton.h"
-#include "base/metrics/histogram.h"
 #include "base/sequenced_task_runner.h"
 #include "base/stl_util.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ -105,15 +104,6 @@
     it->Run();
   }
   init_callbacks_.clear();
-
-  uint64 cache_size = 0;
-  size_t extensions_count = 0;
-  if (cache_->GetStatistics(&cache_size, &extensions_count)) {
-    UMA_HISTOGRAM_COUNTS_100("Extensions.ExtensionCacheCount",
-                             extensions_count);
-    UMA_HISTOGRAM_MEMORY_MB("Extensions.ExtensionCacheSize",
-                            cache_size / (1024 * 1024));
-  }
 }
 
 void ExtensionCacheImpl::Observe(int type,