Move common ImageFetcher component files to core/

components/image_fetcher/core/image_decoder.h

Index: components/image_fetcher/core/image_decoder.h
diff --git a/components/image_fetcher/image_decoder.h b/components/image_fetcher/core/image_decoder.h
similarity index 89%
rename from components/image_fetcher/image_decoder.h
rename to components/image_fetcher/core/image_decoder.h
index b5589f17b4a9b69cfa80cc45a0c89466567867aa..5f03db12d4c4c268fd055205b6f3f95d4271398b 100644
--- a/components/image_fetcher/image_decoder.h
+++ b/components/image_fetcher/core/image_decoder.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_IMAGE_FETCHER_IMAGE_DECODER_H_
-#define COMPONENTS_IMAGE_FETCHER_IMAGE_DECODER_H_
+#ifndef COMPONENTS_IMAGE_FETCHER_CORE_IMAGE_DECODER_H_
+#define COMPONENTS_IMAGE_FETCHER_CORE_IMAGE_DECODER_H_
 
 #include <string>
 
@@ -43,4 +43,4 @@ class ImageDecoder {
 
 }  // namespace image_fetcher
 
-#endif  // COMPONENTS_IMAGE_FETCHER_IMAGE_DECODER_H_
+#endif  // COMPONENTS_IMAGE_FETCHER_CORE_IMAGE_DECODER_H_