Track where WebContents are created in order to better understand issue.

chrome/browser/extensions/webstore_install_with_prompt.cc

Index: chrome/browser/extensions/webstore_install_with_prompt.cc
diff --git a/chrome/browser/extensions/webstore_install_with_prompt.cc b/chrome/browser/extensions/webstore_install_with_prompt.cc
index b0ddf40c83e50028f37afeda352784af4e914cf2..846cc36da9b77f2e421dd56675965fdd7fb4688c 100644
--- a/chrome/browser/extensions/webstore_install_with_prompt.cc
+++ b/chrome/browser/extensions/webstore_install_with_prompt.cc
@@ -7,6 +7,7 @@
 #include "chrome/browser/extensions/webstore_installer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 
 using content::WebContents;
 
@@ -21,6 +22,8 @@ WebstoreInstallWithPrompt::WebstoreInstallWithPrompt(
       dummy_web_contents_(
           WebContents::Create(WebContents::CreateParams(profile))),
       parent_window_(NULL) {
+  WebContentsSource::CreateForWebContentsAndLocation(dummy_web_contents_.get(),
+                                                     FROM_HERE);
   set_install_source(WebstoreInstaller::INSTALL_SOURCE_OTHER);
 }
 
@@ -34,6 +37,8 @@ WebstoreInstallWithPrompt::WebstoreInstallWithPrompt(
       dummy_web_contents_(
           WebContents::Create(WebContents::CreateParams(profile))),
       parent_window_(parent_window) {
+  WebContentsSource::CreateForWebContentsAndLocation(dummy_web_contents_.get(),
+                                                     FROM_HERE);
   if (parent_window_)
     parent_window_tracker_ = NativeWindowTracker::Create(parent_window);
   set_install_source(WebstoreInstaller::INSTALL_SOURCE_OTHER);