More Windows 64b compilation warning fixes

src/views/win/SkOSWindow_win.cpp

Index: src/views/win/SkOSWindow_win.cpp
===================================================================
--- src/views/win/SkOSWindow_win.cpp	(revision 12322)
+++ src/views/win/SkOSWindow_win.cpp	(working copy)
@@ -130,9 +130,12 @@
             this->handleChar(SkUTF8_ToUnichar((char*)&wParam));
             return true;
         } break;
-        case WM_SIZE:
-            this->resize(lParam & 0xFFFF, lParam >> 16);
+        case WM_SIZE: {
+            INT width = LOWORD(lParam);
+            INT height = HIWORD(lParam);
+            this->resize(width, height);
             break;
+        }
         case WM_PAINT: {
             PAINTSTRUCT ps;
             HDC hdc = BeginPaint(hWnd, &ps);