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

Review URL: https://codereview.chromium.org/472213002

Cr-Commit-Position: refs/heads/master@{#290046}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290046 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 8caaa2dc..47c2d15 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -138,8 +138,6 @@
     deps += [
       "//cc",
       "//chrome/browser/performance_monitor",
-      "//chrome/browser/sync_file_system:sync_file_system_proto",
-      "//chrome/browser/sync_file_system/drive_backend:sync_file_system_drive_proto",
       "//chrome/common/extensions/api:api",
       "//components/autofill/content/browser",
       "//components/dom_distiller/content",
@@ -233,7 +231,11 @@
     ]
   }
   if (enable_extensions) {
-    deps += [ "//chrome/browser/extensions" ]
+    deps += [
+      "//chrome/browser/extensions",
+      "//chrome/browser/sync_file_system:sync_file_system_proto",
+      "//chrome/browser/sync_file_system/drive_backend:sync_file_system_drive_proto",
+    ]
     sources += rebase_path(gypi_values.chrome_browser_extensions_sources,
                            ".", "//chrome")
   }