Use mojo for Chrome Loading, Part 1

content/common/url_loader_factory.mojom

Index: content/common/url_loader_factory.mojom
diff --git a/ios/web/shell/test/shell_test.mm b/content/common/url_loader_factory.mojom
similarity index 58%
copy from ios/web/shell/test/shell_test.mm
copy to content/common/url_loader_factory.mojom
index 5b4cddc172c1c4cafc6884d64c1f2cf5e1514915..6876e3ce1c1a89630980bc664296f4b0f968632c 100644
--- a/ios/web/shell/test/shell_test.mm
+++ b/content/common/url_loader_factory.mojom
@@ -2,11 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#import <UIKit/UIKit.h>
-#import <XCTest/XCTest.h>
+module content.mojom;
 
-@interface EmptyFile : NSObject
-@end
+import "url_loader.mojom";
 
-@implementation EmptyFile
-@end
+interface URLLoaderFactory {
+  CreateURLLoader(URLLoader& loader);
+};