Use BrowserContext as key in API. Switch Autofill to use BC in place of Profile.

chrome/browser/autofill/autofill_manager_delegate.h

Index: chrome/browser/autofill/autofill_manager_delegate.h
diff --git a/chrome/browser/autofill/autofill_manager_delegate.h b/chrome/browser/autofill/autofill_manager_delegate.h
index 1bd95badebf58f332668c15e1e2051924f209afb..915354b7b7d3584d35a7915bb2b5fb037072c68c 100644
--- a/chrome/browser/autofill/autofill_manager_delegate.h
+++ b/chrome/browser/autofill/autofill_manager_delegate.h
@@ -9,6 +9,10 @@ namespace autofill {
 class PasswordGenerator;
 }
 
+namespace content {
+class BrowserContext;
+}
+
 namespace gfx {
 class Rect;
 }
@@ -36,6 +40,13 @@ class AutofillManagerDelegate {
  public:
   virtual ~AutofillManagerDelegate() {}
 
+  // Gets the BrowserContext the AutofillManager is in.
+  virtual content::BrowserContext* GetBrowserContext() const = 0;
+
+  // Gets the BrowserContext the AutofillManager is in, or if in an
+  // incognito mode, the associated (original) BrowserContext.
+  virtual content::BrowserContext* GetOriginalBrowserContext() const = 0;
+
   // Gets the infobar service associated with the delegate.
   virtual InfoBarService* GetInfoBarService() = 0;