third_party/WebKit: fix typos found in comments

third_party/WebKit/Source/core/loader/MixedContentChecker.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 31 matching lines @@
 #include "platform/weborigin/SecurityOrigin.h"
 #include "public/platform/Platform.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 static void measureStricterVersionOfIsMixedContent(LocalFrame* frame, const KURL& url)
 {
     // We're currently only checking for mixed content in `https://*` contexts.
     // What about other "secure" contexts the SchemeRegistry knows about? We'll
-    // use this method to measure the occurance of non-webby mixed content to
+    // use this method to measure the occurrence of non-webby mixed content to
     // make sure we're not breaking the world without realizing it.
     SecurityOrigin* origin = frame->document()->securityOrigin();
     if (MixedContentChecker::isMixedContent(origin, url)) {
         if (frame->document()->securityOrigin()->protocol() != "https")
             UseCounter::count(frame, UseCounter::MixedContentInNonHTTPSFrameThatRestrictsMixedContent);
     } else if (!SecurityOrigin::isSecure(url) && SchemeRegistry::shouldTreatURLSchemeAsSecure(origin->protocol())) {
         UseCounter::count(frame, UseCounter::MixedContentInSecureFrameThatDoesNotRestrictMixedContent);
     }
 }
 
@@ skipping 426 matching lines @@
 
     // See comment in shouldBlockFetch() about loading the main resource of a subframe.
     if (request.frameType() == WebURLRequest::FrameTypeNested && !SchemeRegistry::shouldTreatURLSchemeAsCORSEnabled(request.url().protocol())) {
         return ContextTypeOptionallyBlockable;
     }
 
     return contextTypeFromContext(request.requestContext(), mixedFrame);
 }
 
 } // namespace blink