Fix more disabled MSVC warnings, base/ edition.

base/debug/trace_event_impl.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 "base/debug/trace_event_impl.h"
 
 #include <algorithm>
 
 #include "base/base_switches.h"
 #include "base/bind.h"
@@ skipping 1301 matching lines @@
     StringTokenizer tokens(*ci, ";");
     if (!tokens.GetNext())
       continue;
     TraceEventSyntheticDelay* delay =
         TraceEventSyntheticDelay::Lookup(tokens.token());
     while (tokens.GetNext()) {
       std::string token = tokens.token();
       char* duration_end;
       double target_duration = strtod(token.c_str(), &duration_end);
       if (duration_end != token.c_str()) {
-        delay->SetTargetDuration(
-            TimeDelta::FromMicroseconds(target_duration * 1e6));
+        delay->SetTargetDuration(TimeDelta::FromMicroseconds(
+            static_cast<int64>(target_duration * 1e6)));
       } else if (token == "static") {
         delay->SetMode(TraceEventSyntheticDelay::STATIC);
       } else if (token == "oneshot") {
         delay->SetMode(TraceEventSyntheticDelay::ONE_SHOT);
       } else if (token == "alternating") {
         delay->SetMode(TraceEventSyntheticDelay::ALTERNATING);
       }
     }
   }
 }
@@ skipping 1237 matching lines @@
 }
 
 ScopedTraceBinaryEfficient::~ScopedTraceBinaryEfficient() {
   if (*category_group_enabled_) {
     TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(category_group_enabled_,
                                                 name_, event_handle_);
   }
 }
 
 }  // namespace trace_event_internal