Deflake ImageWriterUtilityClient browsertest and clients

chrome/browser/extensions/api/image_writer_private/operation_nonchromeos.cc

 // Copyright 2014 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 <stdint.h>
 
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/threading/worker_pool.h"
 #include "chrome/browser/extensions/api/image_writer_private/error_messages.h"
@@ skipping 14 matching lines @@
 
   SetStage(image_writer_api::STAGE_WRITE);
   StartUtilityClient();
 
   int64_t file_size;
   if (!base::GetFileSize(image_path_, &file_size)) {
     Error(error::kImageReadError);
     return;
   }
 
-  BrowserThread::PostTask(
-      BrowserThread::IO,
-      FROM_HERE,
-      base::Bind(
-          &ImageWriterUtilityClient::Write,
-          image_writer_client_,
-          base::Bind(&Operation::WriteImageProgress, this, file_size),
-          base::Bind(&Operation::CompleteAndContinue, this, continuation),
-          base::Bind(&Operation::Error, this),
-          image_path_,
-          device_path_));
+  image_writer_client_->Write(
+      base::Bind(&Operation::WriteImageProgress, this, file_size),
+      base::Bind(&Operation::CompleteAndContinue, this, continuation),
+      base::Bind(&Operation::Error, this), image_path_, device_path_);
 }
 
 void Operation::VerifyWrite(const base::Closure& continuation) {
   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
 
   if (IsCancelled()) {
     return;
   }
 
   SetStage(image_writer_api::STAGE_VERIFYWRITE);
   StartUtilityClient();
 
   int64_t file_size;
   if (!base::GetFileSize(image_path_, &file_size)) {
     Error(error::kImageReadError);
     return;
   }
 
-  BrowserThread::PostTask(
-      BrowserThread::IO,
-      FROM_HERE,
-      base::Bind(
-          &ImageWriterUtilityClient::Verify,
-          image_writer_client_,
-          base::Bind(&Operation::WriteImageProgress, this, file_size),
-          base::Bind(&Operation::CompleteAndContinue, this, continuation),
-          base::Bind(&Operation::Error, this),
-          image_path_,
-          device_path_));
+  image_writer_client_->Verify(
+      base::Bind(&Operation::WriteImageProgress, this, file_size),
+      base::Bind(&Operation::CompleteAndContinue, this, continuation),
+      base::Bind(&Operation::Error, this), image_path_, device_path_);
 }
 
 }  // namespace image_writer
 }  // namespace extensions