Remove a bunch of TOOLKIT_GTK in content/ and gpu/, as well as NPAPI plugins on linux

gpu/command_buffer/tests/gl_tests_main.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #if defined(OS_MACOSX)
 #include "base/mac/scoped_nsautorelease_pool.h"
 #endif
 #include "gpu/command_buffer/client/gles2_lib.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "gpu/config/gpu_util.h"
 #include "ui/gl/gl_surface.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/jni_android.h"
 #include "ui/gl/android/gl_jni_registrar.h"
 #endif
 
-#if defined(TOOLKIT_GTK)
-#include "ui/gfx/gtk_util.h"
-#endif
-
 int main(int argc, char** argv) {
 #if defined(OS_ANDROID)
   ui::gl::android::RegisterJni(base::android::AttachCurrentThread());
 #else
   base::AtExitManager exit_manager;
 #endif
   CommandLine::Init(argc, argv);
 #if defined(OS_MACOSX)
   base::mac::ScopedNSAutoreleasePool pool;
 #endif
-#if defined(TOOLKIT_GTK)
-    gfx::GtkInitFromCommandLine(*CommandLine::ForCurrentProcess());
-#endif
   gfx::GLSurface::InitializeOneOff();
   ::gles2::Initialize();
   gpu::ApplyGpuDriverBugWorkarounds(CommandLine::ForCurrentProcess());
   base::MessageLoop main_message_loop;
   return GLTestHelper::RunTests(argc, argv);
 }