Include Pepper headers only if ENABLE_PLUGINS is defined

content/zygote/zygote_main_linux.cc

Index: content/zygote/zygote_main_linux.cc
diff --git a/content/zygote/zygote_main_linux.cc b/content/zygote/zygote_main_linux.cc
index 5e3746be9bbcd1f5df539175fee25606619296e2..b77471a88d956a5fae66617ba90718fa4e187460 100644
--- a/content/zygote/zygote_main_linux.cc
+++ b/content/zygote/zygote_main_linux.cc
@@ -27,12 +27,10 @@
 #include "build/build_config.h"
 #include "content/common/child_process_sandbox_support_impl_linux.h"
 #include "content/common/font_config_ipc_linux.h"
-#include "content/common/pepper_plugin_list.h"
 #include "content/common/sandbox_linux/sandbox_linux.h"
 #include "content/common/zygote_commands_linux.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
-#include "content/public/common/pepper_plugin_info.h"
 #include "content/public/common/sandbox_linux.h"
 #include "content/public/common/zygote_fork_delegate_linux.h"
 #include "content/zygote/zygote_linux.h"
@@ -51,6 +49,11 @@
 #include <openssl/rand.h>
 #endif
 
+#if defined(ENABLE_PLUGINS)
+#include "content/common/pepper_plugin_list.h"
+#include "content/public/common/pepper_plugin_info.h"
+#endif
+
 #if defined(ENABLE_WEBRTC)
 #include "third_party/libjingle/overrides/init_webrtc.h"
 #endif