Dead code removal: remove MetricsResponse implementation and tests

chrome/browser/metrics/metrics_response.cc

-// Copyright (c) 2006-2008 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/metrics/metrics_response.h"
-
-#include "libxml/parser.h"
-
-// State to pass around during SAX parsing.
-struct SAXState {
-  int collectors;
-  int events;
-  int interval;
-};
-
-// libxml uses xmlChar*, which is unsigned char*
-inline const char* Char(const xmlChar* input) {
-  return reinterpret_cast<const char*>(input);
-}
-
-static void SAXStartElement(void* user_data,
-                            const xmlChar* name,
-                            const xmlChar** attrs) {
-  if (!name || !attrs)
-    return;
-
-  SAXState* state = static_cast<SAXState*>(user_data);
-
-  if (strcmp(Char(name), "upload") == 0) {
-    for (int i = 0; attrs[i] && attrs[i + i]; i += 2) {
-      if (strcmp(Char(attrs[i]), "interval") == 0) {
-        state->interval = atoi(Char(attrs[i + 1]));
-        return;
-      }
-    }
-  } else if (strcmp(Char(name), "limit") == 0) {
-    for (int i = 0; attrs[i] && attrs[i + 1]; i += 2) {
-      if (strcmp(Char(attrs[i]), "events") == 0) {
-        state->events = atoi(Char(attrs[i + 1]));
-        return;
-      }
-    }
-  } else if (strcmp(Char(name), "collector") == 0) {
-    for (int i = 0; attrs[i] && attrs[i + 1]; i += 2) {
-      if (strcmp(Char(attrs[i]), "type") == 0) {
-        const char* type = Char(attrs[i + 1]);
-        if (strcmp(type, "document") == 0) {
-          state->collectors |= MetricsResponse::COLLECTOR_DOCUMENT;
-        } else if (strcmp(type, "profile") == 0) {
-          state->collectors |= MetricsResponse::COLLECTOR_PROFILE;
-        } else if (strcmp(type, "window") == 0) {
-          state->collectors |= MetricsResponse::COLLECTOR_WINDOW;
-        } else if (strcmp(type, "ui") == 0) {
-          state->collectors |= MetricsResponse::COLLECTOR_UI;
-        }
-        return;
-      }
-    }
-  }
-}
-
-MetricsResponse::MetricsResponse(const std::string& response_xml)
-    : valid_(false),
-      collectors_(COLLECTOR_NONE),
-      events_(0),
-      interval_(0) {
-  if (response_xml.empty())
-    return;
-
-  xmlSAXHandler handler = {0};
-  handler.startElement = SAXStartElement;
-  SAXState state = {0};
-
-  valid_ = !xmlSAXUserParseMemory(&handler, &state,
-                                  response_xml.data(),
-                                  static_cast<int>(response_xml.size()));
-
-  collectors_ = state.collectors;
-  events_ = state.events;
-  interval_ = state.interval;
-}