Remove HttpStreamFactory::spdy_enabled_ static member and accessors.

components/policy/resources/policy_templates.json

 {
 # policy_templates.json - Metafile for policy templates
 #
 # The content of this file is evaluated as a Python expression.
 #
 # This file is used as input to generate the following policy templates:
 # ADM, ADMX+ADML, MCX/plist and html documentation.
 #
 # Policy templates are user interface definitions or documents about the
 # policies that can be used to configure Chrome. Each policy is a name-value
@@ skipping 457 matching lines @@
     },
     {
       'name': 'DisableSpdy',
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': ['chrome.*:8-', 'chrome_os:11-', 'android:30-'],
       'features': {
         'dynamic_refresh': True,
         'per_profile': False,
       },
+      'deprecated': True,
       'example_value': True,
       'id': 8,
       'caption': '''Disable SPDY protocol''',
       'tags': [],
-      'desc': '''Disables use of the SPDY protocol in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>.
+      'desc': '''This policy is deprecated, because SPDY/3.1 support is removed.
+
+      Disables use of the SPDY protocol in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>.
 
       If this policy is enabled the SPDY protocol will not be available in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>.
 
       Setting this policy to disabled will allow the usage of SPDY.
 
       If this policy is left not set, SPDY will be available.''',
     },
     {
       'name': 'DisabledSchemes',
       'type': 'list',
@@ skipping 8372 matching lines @@
       'desc': '''Text appended in parentheses next to the policies top-level container to indicate that those policies are of the Recommended level''',
       'text': 'Default Settings (users can override)',
     },
     'doc_complex_policies_on_windows': {
       'desc': '''Text pointing the user to a help article for complex policies on Windows''',
       'text': '''encoded as a JSON string, for details see <ph name="COMPLEX_POLICIES_URL">https://www.chromium.org/administrators/complex-policies-on-windows<ex>https://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }