Move common ImageFetcher component files to core/

components/image_fetcher/core/request_metadata.h

Index: components/image_fetcher/core/request_metadata.h
diff --git a/components/image_fetcher/request_metadata.h b/components/image_fetcher/core/request_metadata.h
similarity index 81%
rename from components/image_fetcher/request_metadata.h
rename to components/image_fetcher/core/request_metadata.h
index 03963eeb687a7ea1328b8cc564b09adf614027ba..fbff28c177704a6c875386b1c7a739dcde13d0a0 100644
--- a/components/image_fetcher/request_metadata.h
+++ b/components/image_fetcher/core/request_metadata.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_REQUEST_METADATA_H_
-#define COMPONENTS_IMAGE_FETCHER_REQUEST_METADATA_H_
+#ifndef COMPONENTS_IMAGE_FETCHER_CORE_REQUEST_METADATA_H_
+#define COMPONENTS_IMAGE_FETCHER_CORE_REQUEST_METADATA_H_
 
 #include <string>
 
@@ -31,4 +31,4 @@ bool operator!=(const RequestMetadata& lhs, const RequestMetadata& rhs);
 
 }  // namespace image_fetcher
 
-#endif  // COMPONENTS_IMAGE_FETCHER_REQUEST_METADATA_H_
+#endif  // COMPONENTS_IMAGE_FETCHER_CORE_REQUEST_METADATA_H_