Removed partial Client Hints implementation from the Chrome side.

chrome/browser/net/client_hints.cc

Index: chrome/browser/net/client_hints.cc
diff --git a/chrome/browser/net/client_hints.cc b/chrome/browser/net/client_hints.cc
deleted file mode 100644
index af22726c4051c9addb3fb4a4be58078d9be8d2ff..0000000000000000000000000000000000000000
--- a/chrome/browser/net/client_hints.cc
+++ /dev/null
@@ -1,70 +0,0 @@
-// Copyright 2013 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.
-
-#include "chrome/browser/net/client_hints.h"
-
-#include <locale>
-
-#include "base/bind.h"
-#include "base/strings/stringprintf.h"
-#include "base/task_runner_util.h"
-#include "content/public/browser/browser_thread.h"
-#include "ui/gfx/screen.h"
-
-namespace {
-
-float FetchScreenInfoOnUIThread() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  // TODO(bengr): Consider multi-display scenarios.
-  gfx::Display display = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
-  return display.device_scale_factor();
-}
-
-}  // namespace
-
-const char ClientHints::kDevicePixelRatioHeader[] = "CH-DPR";
-
-ClientHints::ClientHints()
-    : weak_ptr_factory_(this) {
-}
-
-ClientHints::~ClientHints() {
-}
-
-void ClientHints::Init() {
-  // TODO(bengr): Observe the device pixel ratio in case it changes during
-  // the Chrome session.
-  RetrieveScreenInfo();
-}
-
-bool ClientHints::RetrieveScreenInfo() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
-  return content::BrowserThread::PostTaskAndReplyWithResult(
-      content::BrowserThread::UI,
-      FROM_HERE,
-      base::Bind(&FetchScreenInfoOnUIThread),
-      base::Bind(
-          &ClientHints::UpdateScreenInfo, weak_ptr_factory_.GetWeakPtr()));
-}
-
-const std::string& ClientHints::GetDevicePixelRatioHeader() const {
-  return screen_hints_;
-}
-
-void ClientHints::UpdateScreenInfo(float device_pixel_ratio_value) {
-  if (device_pixel_ratio_value <= 0.0)
-    return;
-  std::string device_pixel_ratio = base::StringPrintf("%.2f",
-      device_pixel_ratio_value);
-  // Make sure the Client Hints value doesn't change
-  // according to the machine's locale
-  std::locale locale;
-  for (std::string::iterator it = device_pixel_ratio.begin();
-       it != device_pixel_ratio.end(); ++it) {
-    if (!std::isdigit(*it, locale))
-      *it = '.';
-  }
-  screen_hints_ = device_pixel_ratio;
-}
-