Update instrumentation for many different bugs based on new UMA data.

net/proxy/proxy_script_decider.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/proxy_script_decider.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
@@ skipping 70 matching lines @@
     DhcpProxyScriptFetcher* dhcp_proxy_script_fetcher,
     NetLog* net_log)
     : proxy_script_fetcher_(proxy_script_fetcher),
       dhcp_proxy_script_fetcher_(dhcp_proxy_script_fetcher),
       current_pac_source_index_(0u),
       pac_mandatory_(false),
       next_state_(STATE_NONE),
       net_log_(BoundNetLog::Make(net_log, NetLog::SOURCE_PROXY_SCRIPT_DECIDER)),
       fetch_pac_bytes_(false),
       quick_check_enabled_(true) {
+  // TODO(pkasting): Remove ScopedTracker below once crbug.com/455942 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "455942 ProxyScriptDecider::ProxyScriptDecider"));
   if (proxy_script_fetcher &&
       proxy_script_fetcher->GetRequestContext() &&
       proxy_script_fetcher->GetRequestContext()->host_resolver()) {
       host_resolver_.reset(new SingleRequestHostResolver(
           proxy_script_fetcher->GetRequestContext()->host_resolver()));
   }
 }
 
 ProxyScriptDecider::~ProxyScriptDecider() {
   if (next_state_ != STATE_NONE)
@@ skipping 376 matching lines @@
   }
 
   // This is safe to call in any state.
   if (dhcp_proxy_script_fetcher_)
     dhcp_proxy_script_fetcher_->Cancel();
 
   DidComplete();
 }
 
 }  // namespace net