Always use ENABLE_PLUGINS to indicate plugins support.

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 46a0321536da91f73d74cc9d3b51fd08029050d8..a7cee0c8fb4a59ce071081f5af454c0b888f3b1b 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -911,7 +911,7 @@ const char kPluginsEnabledPlugins[] = "plugins.plugins_enabled";
 const char kNpapiFlashMigratedToPepperFlash[] =
     "plugins.npapi_flash_migrated_to_pepper_flash";
 
-#if !defined(OS_ANDROID)
+#if defined(ENABLE_PLUGINS)
 // Whether about:plugins is shown in the details mode or not.
 const char kPluginsShowDetails[] = "plugins.show_details";
 #endif
@@ -952,7 +952,7 @@ const char kShowUpdatePromotionInfoBar[] =
 // true, we draw a custom chrome frame (thicker title bar and blue border).
 const char kUseCustomChromeFrame[] = "browser.custom_chrome_frame";
 
-#if !defined(OS_ANDROID)
+#if defined(ENABLE_PLUGINS)
 // Which plugins have been whitelisted manually by the user.
 const char kContentSettingsPluginWhitelist[] =
     "profile.content_settings.plugin_whitelist";