[Telemetry] Resolve errors due to new pylint checker.

tools/telemetry/telemetry/core/gpu_device_unittest.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import unittest
 
 from telemetry.core import gpu_device
 
 
 class TestGPUDevice(unittest.TestCase):
+
   def testConstruction(self):
     device = gpu_device.GPUDevice(1000, 2000, 'test_vendor', 'test_device')
     self.assertEquals(device.vendor_id, 1000)
     self.assertEquals(device.device_id, 2000)
     self.assertEquals(device.vendor_string, 'test_vendor')
     self.assertEquals(device.device_string, 'test_device')
 
   def testFromDict(self):
-    dictionary = { 'vendor_id': 3000,
-                   'device_id': 4000,
-                   'vendor_string': 'test_vendor_2',
-                   'device_string': 'test_device_2' }
+    dictionary = {'vendor_id': 3000,
+                  'device_id': 4000,
+                  'vendor_string': 'test_vendor_2',
+                  'device_string': 'test_device_2'}
     device = gpu_device.GPUDevice.FromDict(dictionary)
     self.assertEquals(device.vendor_id, 3000)
     self.assertEquals(device.device_id, 4000)
     self.assertEquals(device.vendor_string, 'test_vendor_2')
     self.assertEquals(device.device_string, 'test_device_2')
 
   def testMissingAttrsFromDict(self):
     data = {
-      'vendor_id': 1,
-      'device_id': 2,
-      'vendor_string': 'a',
-      'device_string': 'b'
+        'vendor_id': 1,
+        'device_id': 2,
+        'vendor_string': 'a',
+        'device_string': 'b'
     }
 
     for k in data:
       data_copy = data.copy()
       del data_copy[k]
       try:
         gpu_device.GPUDevice.FromDict(data_copy)
         self.fail('Should raise exception if attribute "%s" is missing' % k)
       except AssertionError:
         raise
-      except:
+      except KeyError:
         pass