Revert 123140 - Use SequencedWorkerPool for disk operations in TraceSubscriberStdio.

content/browser/trace_subscriber_stdio_unittest.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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 "content/browser/trace_subscriber_stdio.h"
 
-#include "base/message_loop.h"
 #include "base/scoped_temp_dir.h"
-#include "base/threading/sequenced_worker_pool.h"
-#include "content/public/browser/browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-TEST(TraceSubscriberStdioTest, CanWriteDataToFile) {
-  ScopedTempDir trace_dir;
-  ASSERT_TRUE(trace_dir.CreateUniqueTempDir());
-  FilePath trace_file(trace_dir.path().AppendASCII("trace.txt"));
-  {
-    content::TraceSubscriberStdio subscriber(trace_file);
+namespace {
 
-    std::string foo("foo");
-    subscriber.OnTraceDataCollected(
-        make_scoped_refptr(base::RefCountedString::TakeString(&foo)));
+class TraceSubscriberStdioTest : public testing::Test {
+ public:
+  virtual void SetUp() {
+    ASSERT_TRUE(trace_dir_.CreateUniqueTempDir());
+    trace_file_ = trace_dir_.path().AppendASCII("trace.txt");
+  }
 
-    std::string bar("bar");
-    subscriber.OnTraceDataCollected(
-        make_scoped_refptr(base::RefCountedString::TakeString(&bar)));
+  std::string ReadTraceFile() {
+    std::string result;
+    EXPECT_TRUE(file_util::ReadFileToString(trace_file_, &result));
+    return result;
+  }
 
-    subscriber.OnEndTracingComplete();
-  }
-  content::BrowserThread::GetBlockingPool()->FlushForTesting();
-  std::string result;
-  EXPECT_TRUE(file_util::ReadFileToString(trace_file, &result));
-  EXPECT_EQ("[foo,bar]", result);
+  ScopedTempDir trace_dir_;
+  FilePath trace_file_;
+};
+
+}  // namespace
+
+TEST_F(TraceSubscriberStdioTest, CanWriteDataToFile) {
+  TraceSubscriberStdio subscriber(trace_file_);
+  subscriber.OnTraceDataCollected("[foo]");
+  subscriber.OnTraceDataCollected("[bar]");
+  EXPECT_TRUE(subscriber.IsValid());
+
+  subscriber.OnEndTracingComplete();
+  EXPECT_FALSE(subscriber.IsValid());
 }
+