Full JSON file has to be read instead of first line.

Tools/Scripts/webkitpy/layout_tests/generate_results_dashboard.py

Index: Tools/Scripts/webkitpy/layout_tests/generate_results_dashboard.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/generate_results_dashboard.py b/Tools/Scripts/webkitpy/layout_tests/generate_results_dashboard.py
index d47c48fe870a42ea35659ecc02849ec24862cb12..5c8a2b2987dafc8e4597827f5f77ebbfe814e1b8 100644
--- a/Tools/Scripts/webkitpy/layout_tests/generate_results_dashboard.py
+++ b/Tools/Scripts/webkitpy/layout_tests/generate_results_dashboard.py
@@ -120,8 +120,7 @@ class GenerateDashBoard(object):
                     results_directories.append(full_dir_path)
         results_directories.sort(reverse=True, key=lambda x: self._filesystem.mtime(x))
         current_failing_results_json_file = self._filesystem.join(results_directories[0], 'failing_results.json')
-        with self._filesystem.open_text_file_for_reading(current_failing_results_json_file) as file:
-            input_json_string = file.readline()
+        input_json_string = self._filesystem.read_text_file(current_failing_results_json_file)
         input_json_string = input_json_string[12:-2]   # Remove preceeding string ADD_RESULTS( and ); at the end
         self._current_result_json_dict['tests'] = json.loads(input_json_string)['tests']
         results_directories = results_directories[1:]
@@ -133,13 +132,10 @@ class GenerateDashBoard(object):
         for json_file in results_directories:
             failing_json_file_path = self._filesystem.join(json_file, 'failing_results.json')
             full_json_file_path = self._filesystem.join(json_file, 'full_results.json')
-            with self._filesystem.open_text_file_for_reading(failing_json_file_path) as file:
-                json_string = file.readline()
+            json_string = self._filesystem.read_text_file(failing_json_file_path)
             json_string = json_string[12:-2]   # Remove preceeding string ADD_RESULTS( and ); at the end
             self._old_failing_results_list.append(json.loads(json_string))
-
-            with self._filesystem.open_text_file_for_reading(full_json_file_path) as full_file:
-                json_string_full_result = full_file.readline()
+            json_string_full_result = self._filesystem.read_text_file(full_json_file_path)
             self._old_full_results_list.append(json.loads(json_string_full_result))
         self._copy_dashboard_html()