Add browser availability check to Window AppleScript.

WindowAppleScript initialization with profile sometimes crashes and this
can be due to unavailability of browser creation at that time.
Code added to prevent crash and facilitate further investigation.

Bug: 1144992
Change-Id: I4835f443cca7e29c7f66334b06ca0f878702ea4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2516359Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824769}

chrome/browser/ui/cocoa/applescript/window_applescript.mm

@@ -77,6 +77,14 @@
   }
 
   if ((self = [super init])) {
+    // TODO(https://crbug.com/1144992): If crash fixed, investigate why browser
+    // cannot be created here.
+    if (Browser::GetBrowserCreationStatusForProfile(aProfile) !=
+        Browser::BrowserCreationStatus::kOk) {
+      NOTREACHED();
+      [self release];
+      return nil;
+    }
     _browser = Browser::Create(Browser::CreateParams(aProfile, false));
     chrome::NewTab(_browser);
     _browser->window()->Show();