Revert 239759 "The comment in base64.h implies that base::Base64..."

trunk/src/chrome/browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc

Index: trunk/src/chrome/browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc
===================================================================
--- trunk/src/chrome/browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc	(revision 239920)
+++ trunk/src/chrome/browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc	(working copy)
@@ -371,7 +371,11 @@
   }
 
   std::string encoded_response;
-  base::Base64Encode(response, &encoded_response);
+  if (!base::Base64Encode(response, &encoded_response)) {
+    SetError(kResponseBadBase64Error);
+    SendResponse(false);
+    return;
+  }
 
   results_ = api_epkp::ChallengeMachineKey::Results::Create(encoded_response);
   SendResponse(true);
@@ -540,7 +544,11 @@
   }
 
   std::string encoded_response;
-  base::Base64Encode(response, &encoded_response);
+  if (!base::Base64Encode(response, &encoded_response)) {
+    SetError(kResponseBadBase64Error);
+    SendResponse(false);
+    return;
+  }
 
   results_ = api_epkp::ChallengeUserKey::Results::Create(encoded_response);
   SendResponse(true);