Move ImageFetcher to its own target.

components/image_fetcher/ios/webp_decoder.h

 // Copyright 2013 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 IOS_CHROME_BROWSER_WEBP_TRANSCODE_WEBP_DECODER_H_
-#define IOS_CHROME_BROWSER_WEBP_TRANSCODE_WEBP_DECODER_H_
+#ifndef COMPONENTS_IMAGE_FETCHER_IOS_WEBP_DECODER_H_
+#define COMPONENTS_IMAGE_FETCHER_IOS_WEBP_DECODER_H_
 
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/ref_counted.h"
 #include "third_party/libwebp/webp/decode.h"
 
@@ skipping 51 matching lines @@
   WebPDecoderConfig config_;
   WebpDecoder::State state_;
   std::unique_ptr<WebPIDecoder, WebPIDecoderDeleter> incremental_decoder_;
   base::scoped_nsobject<NSData> output_buffer_;
   base::scoped_nsobject<NSMutableData> features_;
   int has_alpha_;
 };
 
 }  // namespace webp_transcode
 
-#endif  // IOS_CHROME_BROWSER_WEBP_TRANSCODE_WEBP_DECODER_H_
+#endif  // COMPONENTS_IMAGE_FETCHER_IOS_WEBP_DECODER_H_