Remove unneeded windowsx_shim imports

Author: yaakovschectman

shell/platform/windows/flutter_window.h

@@ -14,7 +14,6 @@
 #include "flutter/shell/platform/windows/flutter_windows_view.h"
 #include "flutter/shell/platform/windows/window.h"
 #include "flutter/shell/platform/windows/window_binding_handler.h"
-#include "flutter/shell/platform/windows/windowsx_shim.h"
 
 namespace flutter {
 

shell/platform/windows/flutter_windows_view.h

@@ -26,7 +26,6 @@
 #include "flutter/shell/platform/windows/window_binding_handler.h"
 #include "flutter/shell/platform/windows/window_binding_handler_delegate.h"
 #include "flutter/shell/platform/windows/window_state.h"
-#include "flutter/shell/platform/windows/windowsx_shim.h"
 
 namespace flutter {
 

shell/platform/windows/testing/mock_text_input_manager.h

@@ -9,7 +9,6 @@
 #include <optional>
 
 #include "flutter/shell/platform/windows/text_input_manager.h"
-#include "flutter/shell/platform/windows/windowsx_shim.h"
 #include "gmock/gmock.h"
 
 namespace flutter {

shell/platform/windows/testing/mock_window.h

@@ -7,7 +7,6 @@
 
 #include "flutter/shell/platform/windows/testing/test_keyboard.h"
 #include "flutter/shell/platform/windows/window.h"
-#include "flutter/shell/platform/windows/windowsx_shim.h"
 #include "gmock/gmock.h"
 
 namespace flutter {

shell/platform/windows/testing/mock_window_binding_handler.h

@@ -6,7 +6,6 @@
 #define FLUTTER_SHELL_PLATFORM_WINDOWS_TESTING_MOCK_WINDOW_BINDING_HANDLER_H_
 
 #include "flutter/shell/platform/windows/window_binding_handler.h"
-#include "flutter/shell/platform/windows/windowsx_shim.h"
 #include "gmock/gmock.h"
 
 namespace flutter {

shell/platform/windows/testing/test_keyboard.cc

@@ -5,7 +5,6 @@
 #include "flutter/shell/platform/windows/testing/test_keyboard.h"
 #include "flutter/shell/platform/common/json_message_codec.h"
 #include "flutter/shell/platform/embedder/test_utils/proc_table_replacement.h"
-#include "flutter/shell/platform/windows/windowsx_shim.h"
 
 #include <rapidjson/document.h>
 

shell/platform/windows/testing/wm_builders.h

@@ -8,8 +8,6 @@
 #include <stdint.h>
 #include <windows.h>
 
-#include "flutter/shell/platform/windows/windowsx_shim.h"
-
 namespace flutter {
 namespace testing {