Remove RC4 by default.

components/policy/resources/policy_templates.json

Index: components/policy/resources/policy_templates.json
diff --git a/components/policy/resources/policy_templates.json b/components/policy/resources/policy_templates.json
index ddd184f6065fa5ddd1421c2d545675761568611d..b2825894f80883cedbacad7a94f8332add0b35fc 100644
--- a/components/policy/resources/policy_templates.json
+++ b/components/policy/resources/policy_templates.json
@@ -134,7 +134,7 @@
 #   persistent IDs for all fields (but not for groups!) are needed. These are
 #   specified by the 'id' keys of each policy. NEVER CHANGE EXISTING IDs,
 #   because doing so would break the deployed wire format!
-#   For your editing convenience: highest ID currently used: 309
+#   For your editing convenience: highest ID currently used: 310
 #
 # Placeholders:
 #   The following placeholder strings are automatically substituted:
@@ -7757,6 +7757,30 @@
       A setting of "tls1.2" disables all fallback but this may have a significant compatibility impact.''',
     },
     {
+      'name': 'RC4Enabled',
+      'type': 'main',
+      'schema': {
+        'type': 'boolean',
+      },
+      'supported_on': [
+        'chrome.*:48-52',
+        'chrome_os:48-52',
+        'android:48-52',
+        'ios:48-52',
+      ],
+      'features': {
+        'dynamic_refresh': True,
+        'per_profile': False,
+      },
+      'example_value': False,
+      'id': 310,
+      'caption': '''Whether RC4 cipher suites in TLS are enabled''',
+      'tags': ['system-security'],
+      'desc': '''Warning: RC4 will be completely removed from <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> after version 52 (around September 2016) and this policy will stop working then.
+
+      If the policy is not set, or is set to false, then RC4 cipher suites in TLS will not be enabled. Otherwise it may be set to true to retain compatibility with an outdated server. This is a stopgap measure and the server should be reconfigured.''',
+    },
+    {
       'name': 'ContextualSearchEnabled',
       'type': 'main',
       'schema': { 'type': 'boolean' },