Flip views-dialog button ordering on ChromeOS

This aligns views' platform style on ChromeOS with WebUI and Material.

Bug: chromium:849549
Change-Id: If63603310e5ee7219cb76fa8d82c27ef9f853cb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036890
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738024}

ui/views/style/platform_style.cc

@@ -22,7 +22,7 @@
 
 namespace views {
 
-#if defined(OS_WIN) || defined(OS_CHROMEOS)
+#if defined(OS_WIN)
 const bool PlatformStyle::kIsOkButtonLeading = true;
 #else
 const bool PlatformStyle::kIsOkButtonLeading = false;

ui/views/window/dialog_client_view_unittest.cc

@@ -190,11 +190,7 @@ TEST_F(DialogClientViewTest, RemoveAndUpdateButtons) {
 
 // Test that views inside the dialog client view have the correct focus order.
 TEST_F(DialogClientViewTest, SetupFocusChain) {
-#if defined(OS_WIN) || defined(OS_CHROMEOS)
-  const bool kIsOkButtonOnLeftSide = true;
-#else
-  const bool kIsOkButtonOnLeftSide = false;
-#endif
+  const bool kIsOkButtonOnLeftSide = PlatformStyle::kIsOkButtonLeading;
 
   GetContentsView()->SetFocusBehavior(View::FocusBehavior::ALWAYS);
   // Initially the dialog client view only contains the content view.