getSalesforceInstanceUrl doesn't work when opened a managed VF page

[espl-saket]

Use the site - https://rc-event.na30.visual.force.com/apex/Campaign_Manage?scontrolCaching=1&id=701360000005CqJ

[saket-joshi]

• Tested for the following sample URLs
  • https://na30.salesforce.com/home/home.jsp
  • https://mycustomdomain-dev-ed--erd.ap1.visual.force.com/apex/VF_Page?sfdc.tabName=01r90000000hDtn
  • https://name-space.cs26.visual.force.com/apex/VF_Page?scontrolCaching=1&id=701210000005PO2
  • https://cs26.salesforce.com/home/home.jsp?sdtd=1
• Resolved in branch: issues/1
• Pull request created: #4

[saket-joshi]

Merged to master