platform/loader: move test support files definition to loader/BUILD.gn

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index e6dca8a5dcf73ab4663b998b758c176c8a55a855..3dda07a38bf83a804dbe395e21c5805a702a3ebd 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -1560,13 +1560,6 @@ static_library("test_support") {
   testonly = true
 
   sources = [
-    "loader/testing/FetchTestingPlatformSupport.cpp",
-    "loader/testing/FetchTestingPlatformSupport.h",
-    "loader/testing/MockFetchContext.h",
-    "loader/testing/MockResource.cpp",
-    "loader/testing/MockResource.h",
-    "loader/testing/MockResourceClient.cpp",
-    "loader/testing/MockResourceClient.h",
     "network/mime/MockMimeRegistry.h",
     "scheduler/base/task_queue_manager_delegate_for_test.cc",
     "scheduler/base/test_time_source.cc",
@@ -1638,6 +1631,7 @@ static_library("test_support") {
   deps = [
     "//base/test:test_support",
     "//mojo/edk/system",
+    "//third_party/WebKit/Source/platform/loader:test_support",
   ]
 
   if (is_win) {