grit: Removing option for compress = true

The plan was to migrate everything over to this, but it didn't happen.
Since there are no users of this, it's better to not support this anymore.
See https://chromium-review.googlesource.com/c/chromium/src/+/1803394/2
for an example of confusion with using compress = true.

Change-Id: Ib6d666c2a937c3e024ca5fde6b59eddbd560a13c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825919
Auto-Submit: Sam Maier <smaier@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700055}

tools/grit/grit/node/base.py

@@ -614,7 +614,7 @@ class Node(object):
       The data in gzipped or brotli compressed format. If the format is
       unspecified then this returns the data uncompressed.
     '''
-    if self.attrs.get('compress') in ('gzip', 'true'):
+    if self.attrs.get('compress') == 'gzip':
       # We only use rsyncable compression on Linux.
       # We exclude ChromeOS since ChromeOS bots are Linux based but do not have
       # the --rsyncable option built in for gzip. See crbug.com/617950.

tools/grit/grit/node/structure_unittest.py

@@ -115,25 +115,6 @@ class StructureUnittest(unittest.TestCase):
         os.path.join(test_data_root, 'test_text.txt'), util.BINARY),
                      decompressed_data)
 
-  def testCompressTrue(self):
-    test_data_root = util.PathFromRoot('grit/testdata')
-    root = util.ParseGrdForUnittest(
-        '''
-        <structures>
-          <structure name="TEST_TXT" file="test_text.txt"
-                   compress="true" type="chrome_html" />
-        </structures>''',
-        base_dir=test_data_root)
-    node, = root.GetChildrenOfType(structure.StructureNode)
-    node.RunPreSubstitutionGatherer()
-    compressed = node.GetDataPackValue(lang='en', encoding=1)
-
-    decompressed_data = zlib.decompress(compressed, 16 + zlib.MAX_WBITS)
-    self.assertEqual(
-        util.ReadFile(
-            os.path.join(test_data_root, 'test_text.txt'), util.BINARY),
-        decompressed_data)
-
   def testCompressBrotli(self):
     test_data_root = util.PathFromRoot('grit/testdata')
     root = util.ParseGrdForUnittest(