Fix crash on WebAPK startup

chrome/browser/android/webapk/webapk_installer.cc

Index: chrome/browser/android/webapk/webapk_installer.cc
diff --git a/chrome/browser/android/webapk/webapk_installer.cc b/chrome/browser/android/webapk/webapk_installer.cc
index 403297873b469a9e96ed2854038716e31e891f71..118e10e5038027597f56cc22025b57bd767d3ba4 100644
--- a/chrome/browser/android/webapk/webapk_installer.cc
+++ b/chrome/browser/android/webapk/webapk_installer.cc
@@ -493,6 +493,7 @@ void WebApkInstaller::OnSuccess() {
 
 void WebApkInstaller::OnFailure() {
   FinishCallback callback = finish_callback_;

[dominickn, 2016/10/10 06:05:38]

Any particular reason this needs to be deleted before running the callback?
Could you do:

callback.Run(false, webapk_package_);
delete this;

(same with other locations)

[pkotwicz, 2016/10/10 16:42:01]

There is no particular reason. Changed as requested

+  std::string webapk_package = webapk_package_;
   delete this;
-  callback.Run(false, "");
+  callback.Run(false, webapk_package);
 }