Remove support for the web manifest icon density member.

content/public/common/manifest.cc

 // 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.
 
 #include "content/public/common/manifest.h"
 
 namespace content {
 
-const double Manifest::Icon::kDefaultDensity = 1;
 // We need to provide a value here which is out of the range of a 32-bit integer
 // since otherwise we would not be able to check whether a theme color was valid
 // or not. The simplest way to do this is to simply add one to the maximum
 // possible 32-bit integer.
 const int64_t Manifest::kInvalidOrMissingColor =
     static_cast<int64_t>(std::numeric_limits<int32_t>::max()) + 1;
 const size_t Manifest::kMaxIPCStringLength = 4 * 1024;
 
-Manifest::Icon::Icon()
-    : density(kDefaultDensity) {
-}
+Manifest::Icon::Icon() { }
 
 Manifest::Icon::Icon(const Icon& other) = default;
 
 Manifest::Icon::~Icon() {
 }
 
 Manifest::RelatedApplication::RelatedApplication() {
 }
 
 Manifest::RelatedApplication::~RelatedApplication() {
@@ skipping 20 matching lines @@
          orientation == blink::WebScreenOrientationLockDefault &&
          icons.empty() &&
          related_applications.empty() &&
          !prefer_related_applications &&
          theme_color == Manifest::kInvalidOrMissingColor &&
          background_color == Manifest::kInvalidOrMissingColor &&
          gcm_sender_id.is_null();
 }
 
 } // namespace content