Revert 149852 - Migrate WebRequestRedirectByRegExAction to use RE2

chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h

Index: chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h
===================================================================
--- chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h	(revision 149852)
+++ chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h	(working copy)
@@ -16,6 +16,7 @@
 #include "chrome/browser/extensions/api/web_request/web_request_api_helpers.h"
 #include "chrome/common/extensions/api/events.h"
 #include "googleurl/src/gurl.h"
+#include "unicode/regex.h"
 
 class WebRequestPermission;
 
@@ -37,10 +38,6 @@
 class URLRequest;
 }
 
-namespace re2 {
-class RE2;
-}
-
 namespace extensions {
 
 typedef linked_ptr<extension_web_request_api_helpers::EventResponseDelta>
@@ -251,10 +248,11 @@
 // Action that instructs to redirect a network request.
 class WebRequestRedirectByRegExAction : public WebRequestAction {
  public:
-  // The |to_pattern| has to be passed in RE2 syntax with the exception that
-  // capture groups are referenced in Perl style ($1, $2, ...).
-  WebRequestRedirectByRegExAction(scoped_ptr<re2::RE2> from_pattern,
-                                  const std::string& to_pattern);
+  // The |to_pattern| has to be passed in ICU syntax.
+  // TODO(battre): Change this to Perl style when migrated to RE2.
+  explicit WebRequestRedirectByRegExAction(
+      scoped_ptr<icu::RegexPattern> from_pattern,
+      const std::string& to_pattern);
   virtual ~WebRequestRedirectByRegExAction();
 
   // Conversion of capture group styles between Perl style ($1, $2, ...) and
@@ -272,8 +270,8 @@
       const base::Time& extension_install_time) const OVERRIDE;
 
  private:
-  scoped_ptr<re2::RE2> from_pattern_;
-  std::string to_pattern_;
+  scoped_ptr<icu::RegexPattern> from_pattern_;
+  icu::UnicodeString to_pattern_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRequestRedirectByRegExAction);
 };