mojo: Fix double character inserts on Windows by removing a Linux hack.

mojo/services/public/interfaces/input_events/input_events.mojom

 // 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.
 
 import "mojo/services/public/interfaces/geometry/geometry.mojom"
 import "mojo/services/public/interfaces/input_events/input_event_constants.mojom"
 import "mojo/services/public/interfaces/input_events/input_key_codes.mojom"
 
 module mojo {
 
 struct LocationData {
   Point in_view_location;
   Point? screen_location;
 };
 
 struct KeyData {
   // The chromium event key code; these values are from the ui/ KeyCode enum,
   // which has the fun property of being neither consistently the Windows key
   // code, nor the X11 keycodes. (This value is consistent across platforms
   // for basic ASCII characters; it will differ for modifiers. We don't define
   // this as a mojo enum because mojom doesn't appear to have a platform
   // dependent preprocessor yet.)
   //
   // TODO(erg): Remove this, and declare Win32 keycodes correct by fiat. We can
   // not do this until we remove ui::Event usage from within mojo.
   int32 key_code;
 
+  // Whether this is a character event, and the character value if it is. Note
+  // that this is different than |text|, which holds a value even when there
+  // isn't actually a character to insert. (For example, |text| will be set and
+  // have a value on backspace, and |character| won't.)
   bool is_char;
+  uint16 character;
 
   // The Win32 key code. Because of the web, this is the closest thing that we
   // have to a cross platform key state.
   KeyboardCode windows_key_code;
 
   // The platform specific key code.
   //
   // TODO(erg): This exists only for NPAPI support, pepper USB keyboard support
   // and IME on android support. Theoretically, we should be able to remove this
   // in the medium to long term.
@@ skipping 21 matching lines @@
   EventType action;
   EventFlags flags;
   int64 time_stamp;
   LocationData? location_data;
   KeyData? key_data;
   TouchData? touch_data;
   MouseWheelData? wheel_data;
 };
 
 }