Re-implement app overlap detection with new extent syntax.

chrome/browser/extensions/extensions_service.cc

Index: chrome/browser/extensions/extensions_service.cc
diff --git a/chrome/browser/extensions/extensions_service.cc b/chrome/browser/extensions/extensions_service.cc
index 854cecc38b65a44cc3f4bced748f17cf5d9ceda7..ac8ca03b1ab089cfb6f3caee52e9b3443d49a42a 100644
--- a/chrome/browser/extensions/extensions_service.cc
+++ b/chrome/browser/extensions/extensions_service.cc
@@ -968,7 +968,11 @@ Extension* ExtensionsService::GetExtensionByWebExtent(const GURL& url) {
 
 Extension* ExtensionsService::GetExtensionByOverlappingWebExtent(
     const ExtensionExtent& extent) {
-  // TODO(aa): Make this work for the new extents. http://crbug.com/47445.
+  for (size_t i = 0; i < extensions_.size(); ++i) {
+    if (extensions_[i]->web_extent().OverlapsWith(extent))
+      return extensions_[i];
+  }
+
   return NULL;
 }