Move OmahaQueryParams to a component and add a delegate interface.

chrome/browser/omaha_query_params/chrome_omaha_query_params_delegate.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 "chrome/browser/omaha_query_params/chrome_omaha_query_params_delegate.h"
+
+#include "base/lazy_instance.h"
+#include "base/strings/stringprintf.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/common/chrome_version_info.h"
+
+namespace {
+
+const char kUnknown[] = "unknown";
+const char kStable[] = "stable";
+const char kBeta[] = "beta";
+const char kDev[] = "dev";
+const char kCanary[] = "canary";
+
+base::LazyInstance<ChromeOmahaQueryParamsDelegate> g_delegate =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+ChromeOmahaQueryParamsDelegate::ChromeOmahaQueryParamsDelegate() {
+}
+
+ChromeOmahaQueryParamsDelegate::~ChromeOmahaQueryParamsDelegate() {
+}
+
+// static
+ChromeOmahaQueryParamsDelegate* ChromeOmahaQueryParamsDelegate::GetInstance() {
+  return g_delegate.Pointer();
+}
+
+std::string ChromeOmahaQueryParamsDelegate::GetExtraParams() {
+  return base::StringPrintf("&prodchannel=%s&prodversion=%s&lang=%s",
+                            GetChannelString(),
+                            chrome::VersionInfo().Version().c_str(),
+                            GetLang());
+}
+
+// static
+const char* ChromeOmahaQueryParamsDelegate::GetChannelString() {
+  switch (chrome::VersionInfo::GetChannel()) {
+    case chrome::VersionInfo::CHANNEL_STABLE:
+      return kStable;
+      break;
+    case chrome::VersionInfo::CHANNEL_BETA:
+      return kBeta;
+      break;
+    case chrome::VersionInfo::CHANNEL_DEV:
+      return kDev;
+      break;
+    case chrome::VersionInfo::CHANNEL_CANARY:
+      return kCanary;
+      break;
+    case chrome::VersionInfo::CHANNEL_UNKNOWN:
+      return kUnknown;
+      break;
+  }
+  return kUnknown;
+}
+
+// static
+const char* ChromeOmahaQueryParamsDelegate::GetLang() {
+  return g_browser_process->GetApplicationLocale().c_str();
+}