Disable FSLP on 10.13 while a bug is investigated.

Bug: 742691
Change-Id: I4a80e92818261149d2a0b23e713245ae389ed5f3
Reviewed-on: https://chromium-review.googlesource.com/575846
Commit-Queue: Sidney San Martin <sdy@chromium.org>
Reviewed-by: ccameron chromium <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487941}

chrome/browser/ui/cocoa/browser_window_controller_private.mm

@@ -1125,7 +1125,10 @@ willPositionSheet:(NSWindow*)sheet
   static const bool fullscreen_low_power_disabled_at_command_line =
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableFullscreenLowPowerMode);
-  if (!fullscreen_low_power_disabled_at_command_line) {
+  // Temporarily disabled on 10.13 because the window turns black when exiting
+  // FSLP. See https://crbug.com/742691 for progress.
+  if (!base::mac::IsAtLeastOS10_13() &&
+      !fullscreen_low_power_disabled_at_command_line) {
     WebContents* webContents = [self webContents];
     if (webContents && webContents->GetRenderWidgetHostView()) {
       fullscreenLowPowerCoordinator_.reset(