Remove the enable_task_manager build flag and define.

chrome/browser/printing/print_preview_dialog_controller_browsertest.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 "chrome/browser/printing/print_preview_dialog_controller.h"
 
 #include <memory>
 
 #include "base/bind_helpers.h"
 #include "base/files/file_path.h"
@@ skipping 312 matching lines @@
     frame_count = 0;
     preview_dialog->ForEachFrame(
         base::Bind(&CountFrames, base::Unretained(&frame_count)));
   } while (frame_count < kExpectedFrameCount);
   ASSERT_EQ(kExpectedFrameCount, frame_count);
 
   // Make sure all the frames in the dialog has access to the PDF plugin.
   preview_dialog->ForEachFrame(base::Bind(&CheckPdfPluginForRenderFrame));
 }
 
-#if defined(ENABLE_TASK_MANAGER)
+#if !defined(OS_ANDROID)
 
 namespace {
 
 base::string16 GetExpectedPrefix() {
   return l10n_util::GetStringFUTF16(IDS_TASK_MANAGER_PRINT_PREFIX,
                                     base::string16());
 }
 
 const std::vector<task_manager::WebContentsTag*>& GetTrackedTags() {
   return task_manager::WebContentsTagsManager::GetInstance()->tracked_tags();
@@ skipping 45 matching lines @@
                        PrintPreviewPdfAccessibility) {
   content::BrowserAccessibilityState::GetInstance()->EnableAccessibility();
   ui_test_utils::NavigateToURL(browser(), GURL("data:text/html,HelloWorld"));
   PrintPreview();
   WebContents* preview_dialog = GetPrintPreviewDialog();
   WaitForAccessibilityTreeToContainNodeWithName(preview_dialog, "HelloWorld");
 }
 
 }  // namespace
 
-#endif  // defined(ENABLE_TASK_MANAGER)
+#endif  // !defined(OS_ANDROID)