Remove some unused proxy-related histograms.

net/proxy/dhcp_proxy_script_adapter_fetcher_win.cc

 // 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.
 
 #include "net/proxy/dhcp_proxy_script_adapter_fetcher_win.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
-#include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/task_runner.h"
 #include "base/time/time.h"
 #include "net/base/net_errors.h"
 #include "net/proxy/dhcpcsvc_init_win.h"
 #include "net/proxy/proxy_script_fetcher_impl.h"
 #include "net/url_request/url_request_context.h"
 
 #include <windows.h>
@@ skipping 233 matching lines @@
                               const_cast<LPWSTR>(adapter_name_wide.c_str()),
                               NULL,
                               send_params, request_params,
                               result_buffer.get(), &result_buffer_size,
                               NULL);
     ++retry_count;
   } while (res == ERROR_MORE_DATA && retry_count <= 3);
 
   if (res != NO_ERROR) {
     VLOG(1) << "Error fetching PAC URL from DHCP: " << res;
-    UMA_HISTOGRAM_COUNTS("Net.DhcpWpadUnhandledDhcpError", 1);
   } else if (wpad_params.nBytesData) {
     return SanitizeDhcpApiString(
         reinterpret_cast<const char*>(wpad_params.Data),
         wpad_params.nBytesData);
   }
 
   return "";
 }
 
 // static
@@ skipping 10 matching lines @@
   // first null in case of embedded NULLs; this is the outer
   // constructor that takes the result of c_str() on the inner.  If
   // the server is giving us back a buffer with embedded NULLs,
   // something is broken anyway.  Finally, trim trailing whitespace.
   std::string result(std::string(data, count_bytes).c_str());
   base::TrimWhitespaceASCII(result, base::TRIM_TRAILING, &result);
   return result;
 }
 
 }  // namespace net