[Remoting Host] Handle text event characters that are not presented on the keyboard

remoting/host/linux/unicode_to_keysym.cc

 // Copyright 2014 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 "remoting/host/linux/unicode_to_keysym.h"
 
 #include <algorithm>
 #define XK_MISCELLANY
 #define XK_XKB_KEYS
 #define XK_LATIN1
@@ skipping 803 matching lines @@
   { XK_Hangul_AraeA,                0x318d },
   { XK_Hangul_AraeAE,               0x318e },
 };
 
 bool CompareCodePair(const CodePair& pair, uint32_t unicode) {
   return pair.unicode < unicode;
 }
 
 }  // namespace
 
-void GetKeySymsForUnicode(uint32_t unicode, std::vector<uint32_t>* keysyms) {
-  keysyms->clear();
+std::vector<uint32_t> GetKeySymsForUnicode(uint32_t unicode) {
+  std::vector<uint32_t> keysyms;
 
   // Latin-1 characters have the same values in Unicode and KeySym.
   if ((unicode >= 0x0020 && unicode <= 0x007e) ||
       (unicode >= 0x00a0 && unicode <= 0x00ff)) {
-    keysyms->push_back(unicode);
+    keysyms.push_back(unicode);
   }
 
   const CodePair* map_end = kKeySymUnicodeMap + arraysize(kKeySymUnicodeMap);
   const CodePair* pair =
       std::lower_bound(kKeySymUnicodeMap, map_end, unicode, &CompareCodePair);
   while (pair != map_end && pair->unicode == unicode) {
-    keysyms->push_back(pair->keysym);
+    keysyms.push_back(pair->keysym);
     ++pair;
   }
 
-  keysyms->push_back(0x01000000 | unicode);
+  keysyms.push_back(0x01000000 | unicode);
+  return keysyms;
 }
 
 }  // namespace remoting