[swarming] Remove u literals from client

This CL is made by following command
> find . -type f | xargs sed -i "s/\([= {(\[]\)u'/\1'/g"
> git cl format

Bug: 1247959
Change-Id: I0c2cfc823459532314037ffa5c4d2a6d0a65feea
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/3385093
Auto-Submit: Junji Watanabe <jwata@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
NOKEYCHECK=True
GitOrigin-RevId: 8076ba001c2a005c5dea1ad8621a9fe1bfc2890a
diff --git a/tests/stream_test.py b/tests/stream_test.py
index 30990c0..62061a0 100755
--- a/tests/stream_test.py
+++ b/tests/stream_test.py
@@ -137,14 +137,14 @@
           fd.get_viewer_url(),
           'https://example.appspot.com/v/?s=test%2Ffoo%2Fbar%2F%2B%2Fmystream')
       fd.write('text\nstream\nlines\n')
-      fd.write(u'šŸ˜„\nšŸ˜„\nšŸ˜„')
+      fd.write('šŸ˜„\nšŸ˜„\nšŸ˜„')
 
     conn = client.last_conn
     self.assertTrue(conn.closed)
 
     header, data = conn.interpret()
     self.assertEqual(header, {'name': 'mystream', 'type': 'text'})
-    self.assertEqual(data.decode('utf-8'), u'text\nstream\nlines\nšŸ˜„\nšŸ˜„\nšŸ˜„')
+    self.assertEqual(data.decode('utf-8'), 'text\nstream\nlines\nšŸ˜„\nšŸ˜„\nšŸ˜„')
 
   def testTextStreamWithParams(self):
     client = self._registry.create('test:value')
@@ -169,7 +169,7 @@
         'contentType': 'foo/bar',
          'tags': {'foo': 'bar', 'baz': 'qux'},
     })
-    self.assertEqual(data.decode('utf-8'), u'text!')
+    self.assertEqual(data.decode('utf-8'), 'text!')
 
   def testBinaryStream(self):
     client = self._registry.create('test:value',
@@ -260,7 +260,7 @@
 
     header, data = conn.interpret()
     self.assertEqual(header, {'name': 'mystream', 'type': 'text'})
-    self.assertEqual(data.decode('utf-8'), u'Using a text stream.')
+    self.assertEqual(data.decode('utf-8'), 'Using a text stream.')
 
 
 if __name__ == '__main__':