Allow chromedriver to install an extension and get all installed extension IDs.

chrome/test/webdriver/commands/create_session.cc

Index: chrome/test/webdriver/commands/create_session.cc
diff --git a/chrome/test/webdriver/commands/create_session.cc b/chrome/test/webdriver/commands/create_session.cc
index fd16c0ba9088ff06ef0c9aca950a7ab71dddd0a5..f78fa382d2a988bedc20bf36c32ffa7c614e6d1f 100644
--- a/chrome/test/webdriver/commands/create_session.cc
+++ b/chrome/test/webdriver/commands/create_session.cc
@@ -74,7 +74,7 @@ void CreateSession::ExecutePost(Response* const response) {
 
   // Install extensions.
   for (size_t i = 0; i < caps.extensions.size(); ++i) {
-    Error* error = session->InstallExtension(caps.extensions[i]);
+    Error* error = session->InstallExtensionDeprecated(caps.extensions[i]);
     if (error) {
       response->SetError(error);
       return;