Move a browser-side File API unittest next to the file it covers.

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 8238e5e0c556fbc1f9df93c24b6e6aac80c0245e..0f29fc6a1382c4c30822ea26db1dd11a22e156bb 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -72,8 +72,6 @@ static_library("test_support") {
     "../public/test/javascript_test_observer.h",
     "../public/test/memory_coordinator_test_utils.cc",
     "../public/test/memory_coordinator_test_utils.h",
-    "../public/test/mock_blob_url_request_context.cc",
-    "../public/test/mock_blob_url_request_context.h",
     "../public/test/mock_download_item.cc",
     "../public/test/mock_download_item.h",
     "../public/test/mock_download_manager.cc",
@@ -1080,7 +1078,6 @@ test("content_unittests") {
     "../browser/download/parallel_download_utils_unittest.cc",
     "../browser/download/rate_estimator_unittest.cc",
     "../browser/download/save_package_unittest.cc",
-    "../browser/fileapi/file_system_operation_impl_write_unittest.cc",
     "../browser/fileapi/file_system_operation_runner_unittest.cc",
     "../browser/fileapi/fileapi_message_filter_unittest.cc",
     "../browser/fileapi/upload_file_system_file_element_reader_unittest.cc",