Misc truncation fixes for gn builds with VS 2015

chrome/test/chromedriver/key_converter_unittest.cc

 // Copyright (c) 2013 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 <list>
 #include <string>
 
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/test/chromedriver/chrome/status.h"
@@ skipping 324 matching lines @@
   const char kTextForKeys[] = {
 #if defined(USE_AURA) || defined(OS_LINUX)
       0, 0, 0, '\b', '\t', 0, '\r', '\r', 0, 0, 0, 0, 0x1B,
       ' ', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x7F, ';', '=',
 #else
       0, 0, 0, 0, 0, 0, '\r', '\r', 0, 0, 0, 0, 0,
       ' ', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ';', '=',
 #endif
       '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
       '*', '+', ',', '-', '.', '/'};
-  for (size_t i = 0; i <= 0x3D; ++i) {
+  for (base::char16 i = 0; i <= 0x3D; ++i) {
     if (i > 0x29 && i < 0x31)
       continue;
     base::string16 keys;
     int modifiers = 0;
     keys.push_back(0xE000U + i);
     std::list<KeyEvent> events;
     if (i == 1) {
       EXPECT_NE(kOk, ConvertKeysToKeyEvents(keys,
                                             true /* release_modifiers*/,
                                             &modifiers, &events).code())
@@ skipping 47 matching lines @@
           kShiftKeyModifierMask | kControlKeyModifierMask),
       CreateKeyUpEvent(ui::VKEY_SHIFT, 0),
       CreateKeyUpEvent(ui::VKEY_CONTROL, 0)};
   base::string16 keys;
   keys.push_back(static_cast<base::char16>(0xE008U));
   keys.push_back(static_cast<base::char16>(0xE009U));
 
   CheckEvents(keys, event_array, true /* release_modifiers */,
       arraysize(event_array), 0);
 }