Remove WebViewKey in rules registry.

extensions/browser/api/declarative/rules_registry.h

Index: extensions/browser/api/declarative/rules_registry.h
diff --git a/extensions/browser/api/declarative/rules_registry.h b/extensions/browser/api/declarative/rules_registry.h
index 4772823f6539d7d18b4bd33b6033d6ccf0fefc56..4fc3178050f5301f1dc825606f8440012fa63f70 100644
--- a/extensions/browser/api/declarative/rules_registry.h
+++ b/extensions/browser/api/declarative/rules_registry.h
@@ -40,18 +40,6 @@ class RulesCacheDelegate;
 class RulesRegistry : public base::RefCountedThreadSafe<RulesRegistry> {
  public:
   typedef extensions::core_api::events::Rule Rule;
-  struct WebViewKey {
-    int embedder_process_id;
-    int webview_instance_id;
-    WebViewKey(int embedder_process_id, int webview_instance_id)
-        : embedder_process_id(embedder_process_id),
-          webview_instance_id(webview_instance_id) {}
-    bool operator<(const WebViewKey& other) const {
-      return embedder_process_id < other.embedder_process_id ||
-          ((embedder_process_id == other.embedder_process_id) &&
-           (webview_instance_id < other.webview_instance_id));
-    }
-  };
 
   enum Defaults { DEFAULT_PRIORITY = 100 };
   // After the RulesCacheDelegate object (the part of the registry which runs on
@@ -63,7 +51,7 @@ class RulesRegistry : public base::RefCountedThreadSafe<RulesRegistry> {
                 const std::string& event_name,
                 content::BrowserThread::ID owner_thread,
                 RulesCacheDelegate* cache_delegate,
-                const WebViewKey& webview_key);
+                int id);
 
   const OneShotEvent& ready() const {
     return ready_;
@@ -145,11 +133,8 @@ class RulesRegistry : public base::RefCountedThreadSafe<RulesRegistry> {
   // The name of the event with which rules are registered.
   const std::string& event_name() const { return event_name_; }
 
-  // The key that identifies the webview (or tabs) in which these rules apply.
-  // If the rules apply to the main browser, then this returns the tuple (0, 0).
-  const WebViewKey& webview_key() const {
-    return webview_key_;
-  }
+  // The unique identifier for this RulesRegistry object.
+  int id() const { return id_; }
 
  protected:
   virtual ~RulesRegistry();
@@ -233,7 +218,7 @@ class RulesRegistry : public base::RefCountedThreadSafe<RulesRegistry> {
   const std::string event_name_;
 
   // The key that identifies the context in which these rules apply.
-  WebViewKey webview_key_;
+  int id_;
 
   RulesDictionary rules_;