Revert 285661 "Remove some dead app host code."

trunk/src/chrome/installer/util/google_update_util.h

Index: trunk/src/chrome/installer/util/google_update_util.h
===================================================================
--- trunk/src/chrome/installer/util/google_update_util.h	(revision 285705)
+++ trunk/src/chrome/installer/util/google_update_util.h	(working copy)
@@ -5,6 +5,8 @@
 #ifndef CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_UTIL_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_UTIL_H_
 
+#include <string>
+
 namespace google_update {
 
 // If user-level Google Update is absent, calls the system-level
@@ -25,6 +27,18 @@
 // GoogleUpdateSettings::ReenableAutoupdatesForApp() to do the work.
 void ElevateIfNeededToReenableUpdates();
 
+// Returns the value corresponding to |key| in untrusted data passed from
+// Google Update.  Returns an empty string if |key| is absent or if its value
+// contains non-printable characters.
+std::string GetUntrustedDataValue(const std::string& key);
+
+// Returns the value corresponding to |key| in untrusted data passed from
+// |tag|.  |tag| should be a printable list of key-value pairs, e.g.
+// "key1=value1&key2=value2".  Returns an empty string if |key| is absent or if
+// its value contains non-printable characters.
+std::string GetUntrustedDataValueFromTag(const std::string& tag,
+                                         const std::string& key);
+
 }  // namespace google_update
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_UTIL_H_