Refactoring: Moving the SafeJsonParser to its own component.

chrome/browser/extensions/webstore_install_helper.cc

Index: chrome/browser/extensions/webstore_install_helper.cc
diff --git a/chrome/browser/extensions/webstore_install_helper.cc b/chrome/browser/extensions/webstore_install_helper.cc
index 948d9954134fe6b38718be0cd34471830942c63a..bc798718e8604d0f604df4bf5a6d2416af263dee 100644
--- a/chrome/browser/extensions/webstore_install_helper.cc
+++ b/chrome/browser/extensions/webstore_install_helper.cc
@@ -7,20 +7,19 @@
 #include <string>
 
 #include "base/bind.h"
+#include "base/memory/weak_ptr.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
-#include "chrome/common/chrome_utility_messages.h"
 #include "chrome/common/extensions/chrome_utility_extensions_messages.h"
 #include "chrome/grit/generated_resources.h"
+#include "components/safe_json_parser/safe_json_parser.h"
 #include "content/public/browser/browser_thread.h"
-#include "content/public/browser/utility_process_host.h"
 #include "net/base/load_flags.h"
 #include "net/url_request/url_request.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using content::BrowserThread;
-using content::UtilityProcessHost;
 
 namespace {
 
@@ -64,33 +63,14 @@ void WebstoreInstallHelper::Start() {
         net::LOAD_DO_NOT_SAVE_COOKIES | net::LOAD_DO_NOT_SEND_COOKIES);
   }
 
-  BrowserThread::PostTask(
-      BrowserThread::IO,
-      FROM_HERE,
-      base::Bind(&WebstoreInstallHelper::StartWorkOnIOThread, this));
-}
-
-void WebstoreInstallHelper::StartWorkOnIOThread() {
-  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  utility_host_ = UtilityProcessHost::Create(
-      this, base::ThreadTaskRunnerHandle::Get().get())->AsWeakPtr();
-  utility_host_->SetName(l10n_util::GetStringUTF16(
-      IDS_UTILITY_PROCESS_JSON_PARSER_NAME));
-  utility_host_->StartBatchMode();
-
-  utility_host_->Send(new ChromeUtilityMsg_ParseJSON(manifest_));
-}
-
-bool WebstoreInstallHelper::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(WebstoreInstallHelper, message)
-    IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Succeeded,
-                        OnJSONParseSucceeded)
-    IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Failed,
-                        OnJSONParseFailed)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
+  base::WeakPtrFactory<WebstoreInstallHelper> weak_factory(this);
+  scoped_refptr<safe_json_parser::SafeJsonParser> parser =
+      new safe_json_parser::SafeJsonParser(
+          manifest_, base::Bind(&WebstoreInstallHelper::OnJSONParseSucceeded,
+                                weak_factory.GetWeakPtr()),
+          base::Bind(&WebstoreInstallHelper::OnJSONParseFailed,
+                     weak_factory.GetWeakPtr()));
+  parser->Start();
 }
 
 void WebstoreInstallHelper::OnFetchComplete(const GURL& url,
@@ -116,16 +96,21 @@ void WebstoreInstallHelper::OnFetchComplete(const GURL& url,
 }
 
 void WebstoreInstallHelper::OnJSONParseSucceeded(
-    const base::ListValue& wrapper) {
+    scoped_ptr<base::Value> wrapper) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   manifest_parse_complete_ = true;
-  const base::Value* value = NULL;
-  CHECK(wrapper.Get(0, &value));
-  if (value->IsType(base::Value::TYPE_DICTIONARY)) {
-    parsed_manifest_.reset(
-        static_cast<const base::DictionaryValue*>(value)->DeepCopy());
-  } else {
+  const base::ListValue* wrapper_list = NULL;
+  if (!wrapper->GetAsList(&wrapper_list)) {
     parse_error_ = Delegate::MANIFEST_ERROR;
+  } else {
+    const base::Value* value = NULL;
+    CHECK(wrapper_list->Get(0, &value));
+    if (value->IsType(base::Value::TYPE_DICTIONARY)) {
+      parsed_manifest_.reset(
+          static_cast<const base::DictionaryValue*>(value)->DeepCopy());
+    } else {
+      parse_error_ = Delegate::MANIFEST_ERROR;
+    }
   }
   ReportResultsIfComplete();
 }
@@ -145,12 +130,6 @@ void WebstoreInstallHelper::ReportResultsIfComplete() {
   if (!icon_decode_complete_ || !manifest_parse_complete_)
     return;
 
-  // The utility_host_ will take care of deleting itself after this call.
-  if (utility_host_.get()) {
-    utility_host_->EndBatchMode();
-    utility_host_.reset();
-  }
-
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,