Move testEvictedTabReloadFailure to an external URL egtest target.

ios/chrome/test/earl_grey/BUILD.gn

Index: ios/chrome/test/earl_grey/BUILD.gn
diff --git a/ios/chrome/test/earl_grey/BUILD.gn b/ios/chrome/test/earl_grey/BUILD.gn
index 32cf9843e2fa82c6e359d8bdca8c5c23f8bc260a..6e186a98cacc5f6c359809a7d85fa57347333196 100644
--- a/ios/chrome/test/earl_grey/BUILD.gn
+++ b/ios/chrome/test/earl_grey/BUILD.gn
@@ -8,6 +8,7 @@ group("all_tests") {
   testonly = true
   deps = [
     ":ios_chrome_device_check_egtests",
+    ":ios_chrome_external_url_egtests",
     ":ios_chrome_flaky_egtests",
     ":ios_chrome_integration_egtests",
     ":ios_chrome_multitasking_egtests",
@@ -135,6 +136,12 @@ chrome_ios_eg_test("ios_chrome_smoke_egtests") {
   libs = [ "XCTest.framework" ]
 }
 
+chrome_ios_eg_test("ios_chrome_external_url_egtests") {
+  deps = [
+    "//ios/chrome/browser/metrics:external_url_eg_tests",
+  ]
+}
+
 source_set("test_support") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true