Include referrer chain with inline install requests.

chrome/browser/extensions/webstore_inline_installer.h

Index: chrome/browser/extensions/webstore_inline_installer.h
diff --git a/chrome/browser/extensions/webstore_inline_installer.h b/chrome/browser/extensions/webstore_inline_installer.h
index 9e11fa42e630eb0dff533f2c5aa7519dfe3bb00e..bc711be3ae2e9121b4d423a6574a5d63ac150f9b 100644
--- a/chrome/browser/extensions/webstore_inline_installer.h
+++ b/chrome/browser/extensions/webstore_inline_installer.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_WEBSTORE_INLINE_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_INLINE_INSTALLER_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
@@ -49,6 +50,7 @@ class WebstoreInlineInstaller : public WebstoreStandaloneInstaller,
   ~WebstoreInlineInstaller() override;
 
   // Implementations WebstoreStandaloneInstaller Template Method's hooks.
+  std::string GetJsonPostData() override;
   bool CheckRequestorAlive() const override;
   const GURL& GetRequestorURL() const override;
   bool ShouldShowPostInstallUI() const override;