Update leak detection policy description

Setting the policy to enabled will only cause credential checking to be
performed if Safe Browsing is also enabled.

Bug: 1028095
Change-Id: I30f5a777cf055997d379d40fefb97db7b2b8dcad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937032
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719607}

components/policy/resources/policy_templates.json

@@ -2701,9 +2701,9 @@
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': [
-        'chrome.*:78-',
-        'chrome_os:78-',
-        'android:78-',
+        'chrome.*:79-',
+        'chrome_os:79-',
+        'android:79-',
       ],
       'features': {
         'can_be_recommended': True,
@@ -2714,9 +2714,11 @@
       'id': 580,
       'caption': '''Enable leak detection for entered credentials''',
       'tags': ['google-sharing'],
-      'desc': '''If this setting is enabled, users can have <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> check whether the entered credentials were part of a leak.
+      'desc': '''This policy can be used to force enable or force disable credential leak checking in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>.
+
+          Note that even if this policy is set to True, the behavior will not trigger if Safe Browsing is disabled (either by policy or by the user). In order to force Safe Browsing on, use the <ph name="SAFE_BROWSING_ENABLED_POLICY_NAME">SafeBrowsingEnabled</ph> policy.
 
-              If this policy is enabled or disabled, users cannot change or override it in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>. If this policy is unset, leak checking is allowed (but can be turned off by the user).''',
+          If this policy is enabled or disabled, users cannot change or override it in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>. If this policy is unset, credential leak checking is allowed (but can be turned off by the user).''',
     },
     {
       'name': 'AutoFillEnabled',