Remove PLT.* histograms.

chrome/renderer/page_load_histograms.h

Index: chrome/renderer/page_load_histograms.h
diff --git a/chrome/renderer/page_load_histograms.h b/chrome/renderer/page_load_histograms.h
deleted file mode 100644
index 4ef3ebb950f7d44bac680a385a8ce3adf2e1c8ef..0000000000000000000000000000000000000000
--- a/chrome/renderer/page_load_histograms.h
+++ /dev/null
@@ -1,80 +0,0 @@
-// Copyright (c) 2012 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.
-
-// TODO(bmcquade): delete this class in October 2016, as it is deprecated by the
-// new PageLoad.* UMA histograms.
-
-#ifndef CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_
-#define CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_
-
-#include "base/macros.h"
-#include "content/public/renderer/render_frame_observer.h"
-#include "content/public/renderer/render_view_observer.h"
-
-namespace blink {
-class WebDataSource;
-}
-
-namespace content {
-class DocumentState;
-}
-
-class PageLoadHistograms : public content::RenderFrameObserver {
- public:
-  explicit PageLoadHistograms(content::RenderFrame* render_frame);
-  ~PageLoadHistograms() override;
-
- private:
-  // RenderFrameObserver implementation.
-  void WillCommitProvisionalLoad() override;
-  void OnDestruct() override;
-
-  // Dump all page load histograms appropriate for the associated frame.
-  //
-  // This method will only dump once-per-instance, so it is safe to call
-  // multiple times.
-  //
-  // The time points we keep are
-  //    request: time document was requested by user
-  //    start: time load of document started
-  //    commit: time load of document started
-  //    finish_document: main document loaded, before onload()
-  //    finish_all_loads: after onload() and all resources are loaded
-  //    first_paint: first paint performed
-  //    first_paint_after_load: first paint performed after load is finished
-  //    begin: request if it was user requested, start otherwise
-  //
-  // It's possible for the request time not to be set, if a client
-  // redirect had been done (the user never requested the page)
-  // Also, it's possible to load a page without ever laying it out
-  // so first_paint and first_paint_after_load can be 0.
-  void Dump();
-
-  void LogPageLoadTime(const content::DocumentState* load_times,
-                       const blink::WebDataSource* ds) const;
-
-  // PageLoadHistograms needs the ClosePage() notification, but it's problematic
-  // to inherit from both RVO and RFO. Embed the RVO in a small helper class
-  // instead.
-  class Helper : public content::RenderViewObserver {
-   public:
-    explicit Helper(PageLoadHistograms* histograms);
-
-    // RenderViewObserver implementation.
-    void ClosePage() override;
-    void OnDestruct() override;
-
-   private:
-    // The Helper is owned by PageLoadHistograms.
-    PageLoadHistograms* const histograms_;
-
-    DISALLOW_COPY_AND_ASSIGN(Helper);
-  };
-
-  Helper helper_;
-
-  DISALLOW_COPY_AND_ASSIGN(PageLoadHistograms);
-};
-
-#endif  // CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_