Update third_party/checkstyle to 7.6.1

tools/android/checkstyle/checkstyle.py

Index: tools/android/checkstyle/checkstyle.py
diff --git a/tools/android/checkstyle/checkstyle.py b/tools/android/checkstyle/checkstyle.py
index 44e1ecf5f122a5d45587685fd92c5690af613173..24338504b3513da5c4a7d169b6f576f8b4578b6b 100644
--- a/tools/android/checkstyle/checkstyle.py
+++ b/tools/android/checkstyle/checkstyle.py
@@ -13,7 +13,15 @@ CHROMIUM_SRC = os.path.normpath(
     os.path.join(os.path.dirname(__file__),
                  os.pardir, os.pardir, os.pardir))
 CHECKSTYLE_ROOT = os.path.join(CHROMIUM_SRC, 'third_party', 'checkstyle',
-                               'checkstyle-6.5-all.jar')
+                               'checkstyle-7.6.1-all.jar')
+
+
+def FormatCheckstyleOutput(checkstyle_output):
+  lines = checkstyle_output.splitlines(True)
+  if 'Checkstyle ends with' in lines[-1]:
+    return ''.join(lines[:-1])
+  else:
+    return checkstyle_output
 
 
 def RunCheckstyle(input_api, output_api, style_file, black_list=None):
@@ -49,8 +57,10 @@ def RunCheckstyle(input_api, output_api, style_file, black_list=None):
   result_errors = []
   result_warnings = []
 
+  formatted_checkstyle_output = FormatCheckstyleOutput(stdout)
+
   local_path = input_api.PresubmitLocalPath()
-  root = xml.dom.minidom.parseString(stdout)
+  root = xml.dom.minidom.parseString(formatted_checkstyle_output)
   for fileElement in root.getElementsByTagName('file'):
     fileName = fileElement.attributes['name'].value
     fileName = os.path.relpath(fileName, local_path)