Don't check is_ios in chrome/, it's always false there.

chrome/browser/resources/BUILD.gn

Index: chrome/browser/resources/BUILD.gn
diff --git a/chrome/browser/resources/BUILD.gn b/chrome/browser/resources/BUILD.gn
index b84210010a512e0cd61ad472d4f5bc9bbfa837f8..8d4b2551a059cabd7dd532c68f2743dfd740429d 100644
--- a/chrome/browser/resources/BUILD.gn
+++ b/chrome/browser/resources/BUILD.gn
@@ -5,6 +5,8 @@
 import("//chrome/common/features.gni")
 import("//tools/grit/grit_rule.gni")
 
+assert(!is_ios, "Chromium/iOS shouldn't use anything in //chrome")
+
 grit("net_internals_resources") {
   source = "net_internals_resources.grd"
   defines = chrome_grit_defines
@@ -67,7 +69,7 @@ grit("translate_internals_resources") {
   output_dir = "$root_gen_dir/chrome"
 }
 
-if (!is_ios && !is_android) {
+if (!is_android) {
   grit("component_extension_resources") {
     source = "component_extension_resources.grd"
     defines = chrome_grit_defines
@@ -129,26 +131,24 @@ if (!is_ios && !is_android) {
   }
 }
 
-if (!is_ios) {
-  grit("quota_internals_resources") {
-    source = "quota_internals_resources.grd"
-    defines = chrome_grit_defines
-    outputs = [
-      "grit/quota_internals_resources.h",
-      "quota_internals_resources.pak",
-    ]
-    output_dir = "$root_gen_dir/chrome"
-  }
+grit("quota_internals_resources") {
+  source = "quota_internals_resources.grd"
+  defines = chrome_grit_defines
+  outputs = [
+    "grit/quota_internals_resources.h",
+    "quota_internals_resources.pak",
+  ]
+  output_dir = "$root_gen_dir/chrome"
+}
 
-  grit("webapks_ui_resources") {
-    source = "webapks_ui_resources.grd"
-    defines = chrome_grit_defines
-    outputs = [
-      "grit/webapks_ui_resources.h",
-      "webapks_ui_resources.pak",
-    ]
-    output_dir = "$root_gen_dir/chrome"
-  }
+grit("webapks_ui_resources") {
+  source = "webapks_ui_resources.grd"
+  defines = chrome_grit_defines
+  outputs = [
+    "grit/webapks_ui_resources.h",
+    "webapks_ui_resources.pak",
+  ]
+  output_dir = "$root_gen_dir/chrome"
 }
 
 if (enable_extensions) {