Resubmit of 149313003: Significantly cleans up the ImageWriter Operation class and subclasses.

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

Index: chrome/browser/extensions/api/image_writer_private/image_writer_private_api.cc
diff --git a/chrome/browser/extensions/api/image_writer_private/image_writer_private_api.cc b/chrome/browser/extensions/api/image_writer_private/image_writer_private_api.cc
index 3d7fd423688ddbdcc07fa89df1ada1072e419dfb..cb08e5611c2f309a949caa6912e0334f7e784b02 100644
--- a/chrome/browser/extensions/api/image_writer_private/image_writer_private_api.cc
+++ b/chrome/browser/extensions/api/image_writer_private/image_writer_private_api.cc
@@ -31,17 +31,6 @@ bool ImageWriterPrivateWriteFromUrlFunction::RunImpl() {
     return false;
   }
 
-#if defined(OS_CHROMEOS)
-  // The Chrome OS temporary partition is too small for Chrome OS images, thus
-  // we must always use the downloads folder.
-  bool save_image_as_download = true;
-#else
-  bool save_image_as_download = false;
-  if (params->options.get() && params->options->save_as_download.get()) {
-    save_image_as_download = true;
-  }
-#endif
-
   std::string hash;
   if (params->options.get() && params->options->image_hash.get()) {
     hash = *params->options->image_hash;
@@ -50,9 +39,7 @@ bool ImageWriterPrivateWriteFromUrlFunction::RunImpl() {
   image_writer::OperationManager::Get(GetProfile())->StartWriteFromUrl(
       extension_id(),
       url,
-      render_view_host(),
       hash,
-      save_image_as_download,
       params->storage_unit_id,
       base::Bind(&ImageWriterPrivateWriteFromUrlFunction::OnWriteStarted,
                  this));
@@ -89,11 +76,11 @@ bool ImageWriterPrivateWriteFromFileFunction::RunImpl() {
   base::FilePath path;
 
   if (!extensions::app_file_handler_util::ValidateFileEntryAndGetPath(
-      filesystem_name,
-      filesystem_path,
-      render_view_host_,
-      &path,
-      &error_))
+           filesystem_name,
+           filesystem_path,
+           render_view_host(),
+           &path,
+           &error_))
     return false;
 
   image_writer::OperationManager::Get(GetProfile())->StartWriteFromFile(