Encapsulate CSS selector declarative content condition tracking

chrome/browser/extensions/api/declarative_content/content_condition.h

Index: chrome/browser/extensions/api/declarative_content/content_condition.h
diff --git a/chrome/browser/extensions/api/declarative_content/content_condition.h b/chrome/browser/extensions/api/declarative_content/content_condition.h
index 134fa8c96b4f1734a6d6cbfbd78d5f6dc386c426..08240c5acc1dacd457330cf7b659b0a5f6455d89 100644
--- a/chrome/browser/extensions/api/declarative_content/content_condition.h
+++ b/chrome/browser/extensions/api/declarative_content/content_condition.h
@@ -5,7 +5,6 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_CONDITION_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_CONDITION_H_
 
-#include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ -13,12 +12,16 @@
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/values.h"
 #include "components/url_matcher/url_matcher.h"
-#include "extensions/browser/api/declarative/declarative_rule.h"
+
+namespace base {
+class Value;
+}
 
 namespace extensions {
 
+class Extension;
+
 struct RendererContentMatchData {
   RendererContentMatchData();
   ~RendererContentMatchData();
@@ -105,8 +108,6 @@ class ContentCondition {
   DISALLOW_COPY_AND_ASSIGN(ContentCondition);
 };
 
-typedef DeclarativeConditionSet<ContentCondition> ContentConditionSet;
-
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_CONDITION_H_