Don't compile code for desktop zoom or GuestViews on mobile platforms.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index eccd8b051618ef2dee5c74ec856d47bdede4d19d..c5095daecbe9a4a2c430186273fb1818746199f3 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1120,6 +1120,7 @@ const char kContentSettingsPluginWhitelist[] =
     "profile.content_settings.plugin_whitelist";
 #endif
 
+#if !defined(OS_ANDROID)
 // Double that indicates the default zoom level.
 const char kPartitionDefaultZoomLevel[] = "partition.default_zoom_level";
 
@@ -1127,9 +1128,8 @@ const char kPartitionDefaultZoomLevel[] = "partition.default_zoom_level";
 // be displayed at the default zoom level.
 const char kPartitionPerHostZoomLevels[] = "partition.per_host_zoom_levels";
 
-#if !defined(OS_ANDROID)
 const char kPinnedTabs[] = "pinned_tabs";
-#endif
+#endif  // !defined(OS_ANDROID)
 
 // Preference to disable 3D APIs (WebGL, Pepper 3D).
 const char kDisable3DAPIs[] = "disable_3d_apis";