Second wave of Win64 warning cleanup

src/views/win/SkOSWindow_win.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkTypes.h"
 
 #if defined(SK_BUILD_FOR_WIN)
@@ skipping 106 matching lines @@
             }
         } break;
         case WM_KEYUP: {
             SkKey key = winToskKey(wParam);
             if (kNONE_SkKey != key) {
                 this->handleKeyUp(key);
                 return true;
             }
         } break;
         case WM_UNICHAR:
-            this->handleChar(wParam);
+            this->handleChar((SkUnichar) wParam);
             return true;
         case WM_CHAR: {
             this->handleChar(SkUTF8_ToUnichar((char*)&wParam));
             return true;
         } break;
         case WM_SIZE:
             this->resize(lParam & 0xFFFF, lParam >> 16);
             break;
         case WM_PAINT: {
             PAINTSTRUCT ps;
@@ skipping 465 matching lines @@
         break;
 #endif // SK_ANGLE
 #endif // SK_SUPPORT_GPU
     default:
         SkASSERT(false);
         break;
     }
 }
 
 #endif