Refactor //ios:all target in preparation of upstreaming.

ios/BUILD.gn

Index: ios/BUILD.gn
diff --git a/ios/BUILD.gn b/ios/BUILD.gn
index 3284952a1270881ab7c1f9f10a177dca3f97da48..737f82c855178092027820da61b67ec074d54334 100644
--- a/ios/BUILD.gn
+++ b/ios/BUILD.gn
@@ -26,21 +26,25 @@ group("all") {
     ]
   } else {
     deps = [
-      "//ios/chrome:ios_chrome_unittests",
-      "//ios/chrome/app",
-      "//ios/chrome/common",
-      "//ios/chrome/common/physical_web",
+      # List all the targets that need to be build on iOS by default.
+      "//ios/chrome/app:chrome",
+      "//ios/chrome/app:chrome_clean_skeleton",
+      "//ios/showcase",
+      "//ios/web/shell:ios_web_shell",
+
+      # List all the test targets that need to be build on iOS by default.
+      "//ios/chrome/test:all_tests",
+      "//ios/chrome/test/earl_grey:all_tests",
+      "//ios/net:all_tests",
+      "//ios/showcase/test:all_tests",
+      "//ios/testing:all_tests",
+      "//ios/web:all_tests",
+      "//ios/web/shell/test:all_tests",
+
+      # Those dependencies are currently only used from downstream code
+      # and will be removed once the dependent code has been upstreamed.
       "//ios/chrome/share_extension:packed_resources",
       "//ios/chrome/today_extension:packed_resources",
-      "//ios/net:ios_net_unittests",
-      "//ios/public/provider/chrome/browser",
-      "//ios/testing:ocmock_support_unittest",
-      "//ios/third_party/earl_grey",
-      "//ios/web:earl_grey_test_support",
-      "//ios/web:ios_web_inttests",
-      "//ios/web:ios_web_unittests",
-      "//ios/web/shell:ios_web_shell",
-      "//ios/web/shell/test:ios_web_shell_egtests",
     ]
   }
 }