Mark some files/targets as compiled only when their associated feature is enabled.

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index 6a2bd2e19bce1699b3b072bcced002bfb99599b1..29b365e6ba117e6cebdb4eb9304c3b5a27baf409 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -35,8 +35,6 @@ group("extra_resources") {
     deps += [
       "//chrome/browser/resources:component_extension_resources",
       "//chrome/browser/resources:options_resources",
-      "//chrome/browser/resources:quota_internals_resources",
-      "//chrome/browser/resources:sync_file_system_internals_resources",
     ]
   }
 
@@ -49,6 +47,13 @@ group("extra_resources") {
       #'browser/resources/chromeos/chromevox/chromevox.gyp:chromevox',  TODO(GYP)
     ]
   }
+
+  if (enable_extensions) {
+    deps += [
+      "//chrome/browser/resources:quota_internals_resources",
+      "//chrome/browser/resources:sync_file_system_internals_resources",
+    ]
+  }
 }
 
 # GYP version: chrome/chrome_resources.gyp:chrome_strings