Stop working around issue 6775.

R=rnystrom@google.com
BUG=

Review URL: https://codereview.chromium.org//23093023

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@26664 260f80e4-7a28-3924-810f-c04153c831b5
diff --git a/lib/src/credentials.dart b/lib/src/credentials.dart
index b02f470..5bbec16 100644
--- a/lib/src/credentials.dart
+++ b/lib/src/credentials.dart
@@ -81,8 +81,7 @@
     var parsed;
     try {
       parsed = JSON.parse(json);
-    } catch (e) {
-      // TODO(nweiz): narrow this catch clause once issue 6775 is fixed.
+    } on FormatException catch (e) {
       validate(false, 'invalid JSON');
     }
 
diff --git a/lib/src/handle_access_token_response.dart b/lib/src/handle_access_token_response.dart
index 5e5f6e2..c14b8d1 100644
--- a/lib/src/handle_access_token_response.dart
+++ b/lib/src/handle_access_token_response.dart
@@ -40,8 +40,7 @@
   var parameters;
   try {
     parameters = JSON.parse(response.body);
-  } catch (e) {
-    // TODO(nweiz): narrow this catch clause once issue 6775 is fixed.
+  } on FormatException catch (e) {
     validate(false, 'invalid JSON');
   }
 
@@ -110,8 +109,7 @@
   var parameters;
   try {
     parameters = JSON.parse(response.body);
-  } catch (e) {
-    // TODO(nweiz): narrow this catch clause once issue 6775 is fixed.
+  } on FormatException catch (e) {
     validate(false, 'invalid JSON');
   }