Remove PLT.* histograms.

chrome/renderer/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//chrome/common/features.gni")
 import("//tools/grit/grit_rule.gni")
 
 grit("resources") {
   source = "resources/renderer_resources.grd"
@@ skipping 30 matching lines @@
     "loadtimes_extension_bindings.cc",
     "loadtimes_extension_bindings.h",
     "media/chrome_key_systems.cc",
     "media/chrome_key_systems.h",
     "net/net_error_helper.cc",
     "net/net_error_helper.h",
     "net/net_error_page_controller.cc",
     "net/net_error_page_controller.h",
     "net_benchmarking_extension.cc",
     "net_benchmarking_extension.h",
-    "page_load_histograms.cc",
-    "page_load_histograms.h",
     "page_load_metrics/metrics_render_frame_observer.cc",
     "page_load_metrics/metrics_render_frame_observer.h",
     "page_load_metrics/page_timing_metrics_sender.cc",
     "page_load_metrics/page_timing_metrics_sender.h",
     "page_load_metrics/renderer_page_track_decider.cc",
     "page_load_metrics/renderer_page_track_decider.h",
     "plugins/non_loadable_plugin_placeholder.cc",
     "plugins/non_loadable_plugin_placeholder.h",
     "plugins/plugin_uma.cc",
     "plugins/plugin_uma.h",
@@ skipping 323 matching lines @@
     ]
   }
 
   if (is_android) {
     sources -= [
       "safe_browsing/mock_feature_extractor_clock.cc",
       "safe_browsing/mock_feature_extractor_clock.h",
     ]
   }
 }