Remove //chrome deps from ExtensionDownloader

extensions/shell/browser/shell_extensions_browser_client.cc

Index: extensions/shell/browser/shell_extensions_browser_client.cc
diff --git a/extensions/shell/browser/shell_extensions_browser_client.cc b/extensions/shell/browser/shell_extensions_browser_client.cc
index 68c34483c4b0f4d1d06dc6666cdeb1f79525c557..b36494ed773b053556c64c8c08a9d1dce41157ac 100644
--- a/extensions/shell/browser/shell_extensions_browser_client.cc
+++ b/extensions/shell/browser/shell_extensions_browser_client.cc
@@ -226,4 +226,13 @@ ExtensionCache* ShellExtensionsBrowserClient::GetExtensionCache() {
   return extension_cache_.get();
 }
 
+bool ShellExtensionsBrowserClient::IsBackgroundUpdateAllowed() {
+  return true;
+}
+
+bool ShellExtensionsBrowserClient::IsMinBrowserVersionSupported(
+    const std::string& min_version) {
+  return true;
+}
+
 }  // namespace extensions