[Extensions Bindings] Add native declarativeContent verification

extensions/common/api/declarative/declarative_constants.h

Index: extensions/common/api/declarative/declarative_constants.h
diff --git a/chrome/browser/extensions/api/declarative_content/content_constants.h b/extensions/common/api/declarative/declarative_constants.h
similarity index 79%
rename from chrome/browser/extensions/api/declarative_content/content_constants.h
rename to extensions/common/api/declarative/declarative_constants.h
index 4286c6ef0bddf43ec3ae691138c584615af16181..719e1633cbb8adb435335d45e54d74bb73394a18 100644
--- a/chrome/browser/extensions/api/declarative_content/content_constants.h
+++ b/extensions/common/api/declarative/declarative_constants.h
@@ -4,8 +4,8 @@
 
 // Constants used for the declarativeContent API.
 
-#ifndef CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_CONSTANTS_H_
-#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_CONSTANTS_H_
+#ifndef EXTENSIONS_COMMON_API_DECLARATIVE_DECLARATIVE_CONSTANTS_H_
+#define EXTENSIONS_COMMON_API_DECLARATIVE_DECLARATIVE_CONSTANTS_H_
 
 namespace extensions {
 namespace declarative_content_constants {
@@ -31,4 +31,4 @@ extern const char kSetIcon[];
 }  // namespace declarative_content_constants
 }  // namespace extensions
 
-#endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_CONSTANTS_H_
+#endif  // EXTENSIONS_COMMON_API_DECLARATIVE_DECLARATIVE_CONSTANTS_H_