Enable size_t to int truncation warnings in PPAPI

ppapi/cpp/dev/ime_input_event_dev.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 "ppapi/cpp/dev/ime_input_event_dev.h"
 
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/module_impl.h"
 #include "ppapi/cpp/var.h"
@@ skipping 43 matching lines @@
     PP_TimeTicks time_stamp,
     const Var& text,
     const std::vector<uint32_t>& segment_offsets,
     int32_t target_segment,
     const std::pair<uint32_t, uint32_t>& selection) : InputEvent() {
   if (!has_interface<PPB_IMEInputEvent_Dev_0_2>())
     return;
   uint32_t dummy = 0;
   PassRefFromConstructor(get_interface<PPB_IMEInputEvent_Dev_0_2>()->Create(
       instance.pp_instance(), type, time_stamp, text.pp_var(),
-      segment_offsets.empty() ? 0 : segment_offsets.size() - 1,
+      segment_offsets.empty() ? 0u :
+          static_cast<uint32_t>(segment_offsets.size() - 1),
       segment_offsets.empty() ? &dummy : &segment_offsets[0],
       target_segment, selection.first, selection.second));
 }
 
 
 Var IMEInputEvent_Dev::GetText() const {
   if (has_interface<PPB_IMEInputEvent_Dev_0_2>()) {
     return Var(PASS_REF,
                get_interface<PPB_IMEInputEvent_Dev_0_2>()->GetText(
                    pp_resource()));
@@ skipping 47 matching lines @@
   } else if (has_interface<PPB_IMEInputEvent_Dev_0_1>()) {
     get_interface<PPB_IMEInputEvent_Dev_0_1>()->GetSelection(pp_resource(),
                                                              &range.first,
                                                              &range.second);
   }
   return range;
 }
 
 
 }  // namespace pp