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

chrome/browser/api/webdata/web_data_service_base.h

Index: chrome/browser/api/webdata/web_data_service_base.h
diff --git a/chrome/browser/api/webdata/web_data_service_base.h b/chrome/browser/api/webdata/web_data_service_base.h
index 88b3084b422fc7d81af1c0eb385290b4fea70a05..b1bfb49bee6552ac2a75b7535779e4b5da18371d 100644
--- a/chrome/browser/api/webdata/web_data_service_base.h
+++ b/chrome/browser/api/webdata/web_data_service_base.h
@@ -7,12 +7,15 @@
 
 #include "chrome/browser/profiles/refcounted_profile_keyed_service.h"
 
-class Profile;
+namespace content {
+class BrowserContext;
+}
 
 // Base for WebDataService class hierarchy.
 class WebDataServiceBase : public RefcountedProfileKeyedService {
  public:
-  static scoped_refptr<WebDataServiceBase> ForProfile(Profile* profile);
+  static scoped_refptr<WebDataServiceBase> ForContext(
+      content::BrowserContext* profile);
 
   // All requests return an opaque handle of the following type.
   typedef int Handle;