Cleanup: Remove most enable_extensions logic in extensions code.

extensions/renderer/messaging_bindings.cc

Index: extensions/renderer/messaging_bindings.cc
diff --git a/extensions/renderer/messaging_bindings.cc b/extensions/renderer/messaging_bindings.cc
index 7902cc08a60953e85d6e7b0cd717ff4d3daec46e..cbb9ec2c9ed1491d452e0ae73c8666189ed9e805 100644
--- a/extensions/renderer/messaging_bindings.cc
+++ b/extensions/renderer/messaging_bindings.cc
@@ -18,6 +18,7 @@
 #include "content/public/renderer/v8_value_converter.h"
 #include "extensions/common/api/messaging/message.h"
 #include "extensions/common/extension_messages.h"
+#include "extensions/common/manifest_handlers/externally_connectable.h"
 #include "extensions/renderer/dispatcher.h"
 #include "extensions/renderer/event_bindings.h"
 #include "extensions/renderer/object_backed_native_handler.h"
@@ -30,12 +31,6 @@
 #include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
 #include "v8/include/v8.h"
 
-// TODO(thestig): Remove #ifdef from this file when extensions are no longer
-// used on mobile.
-#if defined(ENABLE_EXTENSIONS)
-#include "extensions/common/manifest_handlers/externally_connectable.h"
-#endif
-
 // Message passing API example (in a content script):
 // var extension =
 //    new chrome.Extension('00123456789abcdef0123456789abcdef0123456');
@@ -266,7 +261,6 @@ void DispatchOnConnectToScriptContext(
     if (!source_tab->empty() && !extension->is_platform_app())
       tab = converter->ToV8Value(source_tab, script_context->v8_context());
 
-#if defined(ENABLE_EXTENSIONS)
     ExternallyConnectableInfo* externally_connectable =
         ExternallyConnectableInfo::Get(extension);
     if (externally_connectable &&
@@ -276,7 +270,6 @@ void DispatchOnConnectToScriptContext(
                                                      v8::String::kNormalString,
                                                      tls_channel_id.size());
     }
-#endif
   }
 
   v8::Handle<v8::Value> arguments[] = {