Remove //chrome deps from ExtensionDownloader

chrome/browser/extensions/chrome_extensions_browser_client.cc

 // Copyright 2013 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/extensions/chrome_extensions_browser_client.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/version.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
@@ skipping 263 matching lines @@
   if (!extension_cache_.get()) {
 #if defined(OS_CHROMEOS)
     extension_cache_.reset(new ExtensionCacheImpl());
 #else
     extension_cache_.reset(new NullExtensionCache());
 #endif
   }
   return extension_cache_.get();
 }
 
+bool ChromeExtensionsBrowserClient::IsBackgroundUpdateAllowed() {
+  return !CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kDisableBackgroundNetworking);
+}
+
+bool ChromeExtensionsBrowserClient::IsMinBrowserVersionSupported(
+    const std::string& min_version) {
+  chrome::VersionInfo version_info;
+  base::Version browser_version = base::Version(version_info.Version());
+  Version browser_min_version(min_version);
+  if (browser_version.IsValid() && browser_min_version.IsValid() &&
+      browser_min_version.CompareTo(browser_version) > 0) {
+    return false;
+  }
+  return true;
+}
+
 }  // namespace extensions