Introduce WebRequestEventRouterDelegate.

chrome/browser/extensions/api/web_request/web_request_api_helpers.cc

Index: chrome/browser/extensions/api/web_request/web_request_api_helpers.cc
diff --git a/chrome/browser/extensions/api/web_request/web_request_api_helpers.cc b/chrome/browser/extensions/api/web_request/web_request_api_helpers.cc
index 5a2a67236f224ff1e63ad69732a3f690a5f2c46e..d79246d3463a17f1fc336c94e0f5a3bf8d3b32ea 100644
--- a/chrome/browser/extensions/api/web_request/web_request_api_helpers.cc
+++ b/chrome/browser/extensions/api/web_request/web_request_api_helpers.cc
@@ -16,6 +16,7 @@
 #include "components/web_cache/browser/web_cache_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
+#include "extensions/browser/api/web_request/web_request_api_constants.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/runtime_data.h"
 #include "extensions/browser/warning_set.h"
@@ -33,6 +34,8 @@ using base::Time;
 using net::cookie_util::ParsedRequestCookie;
 using net::cookie_util::ParsedRequestCookies;
 
+namespace keys = extension_web_request_api_constants;
+
 namespace extension_web_request_api_helpers {
 
 namespace {
@@ -1178,4 +1181,19 @@ void NotifyWebRequestAPIUsed(
   }
 }
 
+// Converts the |name|, |value| pair of a http header to a HttpHeaders
+// dictionary. Ownership is passed to the caller.
+base::DictionaryValue* ToHeaderDictionary(const std::string& name,
+                                          const std::string& value) {
+  base::DictionaryValue* header = new base::DictionaryValue();
+  header->SetString(keys::kHeaderNameKey, name);
+  if (base::IsStringUTF8(value)) {
+    header->SetString(keys::kHeaderValueKey, value);
+  } else {
+    header->Set(keys::kHeaderBinaryValueKey,
+                StringToCharList(value));
+  }
+  return header;
+}
+
 }  // namespace extension_web_request_api_helpers