Adjust usage of InputPane to be Windows 10 RS4 and later.

Microsoft has confirmed there are some issues with InputPane on earlier
versions before RS4.

BUG=817501

Change-Id: Ifa4557ecf479e10d619a6353e28c4f8eb3684867
Reviewed-on: https://chromium-review.googlesource.com/1093266Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565731}

ui/base/ime/input_method_win_base.cc

@@ -37,7 +37,7 @@ constexpr size_t kExtraNumberOfChars = 20;
 std::unique_ptr<InputMethodKeyboardController> CreateKeyboardController(
     HWND toplevel_window_handle) {
   if (base::FeatureList::IsEnabled(features::kInputPaneOnScreenKeyboard) &&
-      base::win::GetVersion() >= base::win::VERSION_WIN10_RS1) {
+      base::win::GetVersion() >= base::win::VERSION_WIN10_RS4) {
     return std::make_unique<OnScreenKeyboardDisplayManagerInputPane>(
         toplevel_window_handle);
   } else if (base::win::GetVersion() >= base::win::VERSION_WIN8) {