[PPAPI] Fix a bunch of spelling mistakes

ppapi/cpp/url_loader.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_CPP_URL_LOADER_H_
 #define PPAPI_CPP_URL_LOADER_H_
 
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/cpp/resource.h"
 
@@ skipping 36 matching lines @@
 
   /// This function begins loading the <code>URLRequestInfo</code>.
   /// The operation completes when response headers are received or when an
   /// error occurs.  Use GetResponseInfo() to access the response
   /// headers.
   ///
   /// @param[in] request_info A <code>URLRequestInfo</code> corresponding to a
   /// URLRequestInfo.
   /// @param[in] cc A <code>CompletionCallback</code> to run on asynchronous
   /// completion of Open(). This callback will run when response
-  /// headers for the url are received or error occured. This callback
+  /// headers for the url are received or error occurred. This callback
   /// will only run if Open() returns <code>PP_OK_COMPLETIONPENDING</code>.
   ///
   /// @return An int32_t containing an error code from
   /// <code>pp_errors.h</code>.
   int32_t Open(const URLRequestInfo& request_info,
                const CompletionCallback& cc);
 
   /// This function can be invoked to follow a
   /// redirect after Open() completed on receiving redirect headers.
   ///
   /// @param[in] cc A <code>CompletionCallback</code> to run on asynchronous
   /// completion of FollowRedirect(). This callback will run when response
-  /// headers for the redirect url are received or error occured. This callback
+  /// headers for the redirect url are received or error occurred. This callback
   /// will only run if FollowRedirect() returns
   /// <code>PP_OK_COMPLETIONPENDING</code>.
   ///
   /// @return An int32_t containing an error code from
   /// <code>pp_errors.h</code>.
   int32_t FollowRedirect(const CompletionCallback& cc);
 
   /// This function returns the current upload progress (which is only
   /// meaningful after Open() has been called). Progress only refers to the
   /// request body and does not include the headers.
@@ skipping 78 matching lines @@
   ///
   /// <strong>Note:</strong> If the <code>URLLoader</code> object is destroyed
   /// while it is still open, then it will be implicitly closed so you are not
   /// required to call Close().
   void Close();
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_URL_LOADER_H_