Disable data_reduction_proxy unit tests on iOS.

components/BUILD.gn

Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index 198c46060746be569e7272088c27037f72ff1847..8d69cf55449aceb90828c1cf539b741773023908 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -71,8 +71,6 @@ test("components_unittests") {
     "//components/content_settings/core/browser:unit_tests",
     "//components/content_settings/core/common:unit_tests",
     "//components/crx_file:unit_tests",
-    "//components/data_reduction_proxy/core/browser:unit_tests",
-    "//components/data_reduction_proxy/core/common:unit_tests",
     "//components/data_usage/core:unit_tests",
     "//components/device_event_log:unit_tests",
     "//components/dom_distiller/core:unit_tests",
@@ -169,6 +167,8 @@ test("components_unittests") {
       "//components/crash/content/app:unit_tests",
       "//components/crash/core/common:unit_tests",
       "//components/data_reduction_proxy/content/browser:unit_tests",
+      "//components/data_reduction_proxy/core/browser:unit_tests",
+      "//components/data_reduction_proxy/core/common:unit_tests",
       "//components/data_use_measurement/content:unit_tests",
       "//components/display_compositor:unit_tests",
       "//components/dom_distiller/content/browser:unit_tests",