feat(firestore): update the api

#### firestore:v1

The following keys were deleted:
- resources.projects.resources.databases.methods.delete.parameters.allowMissing (Total Keys: 2)
- resources.projects.resources.databases.methods.delete.parameters.validateOnly (Total Keys: 2)

Author: yoshi-automation

docs/dyn/firestore_v1.projects.databases.html

@@ -101,7 +101,7 @@ <h2>Instance Methods</h2>
   <code><a href="#create">create(parent, body=None, databaseId=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Create a database.</p>
 <p class="toc_element">
-  <code><a href="#delete">delete(name, allowMissing=None, etag=None, validateOnly=None, x__xgafv=None)</a></code></p>
+  <code><a href="#delete">delete(name, etag=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Deletes a database.</p>
 <p class="toc_element">
   <code><a href="#exportDocuments">exportDocuments(name, body=None, x__xgafv=None)</a></code></p>
@@ -184,14 +184,12 @@ <h3>Method Details</h3>
 </div>
 
 <div class="method">
-    <code class="details" id="delete">delete(name, allowMissing=None, etag=None, validateOnly=None, x__xgafv=None)</code>
+    <code class="details" id="delete">delete(name, etag=None, x__xgafv=None)</code>
   <pre>Deletes a database.
 
 Args:
   name: string, Required. A name of the form `projects/{project_id}/databases/{database_id}` (required)
-  allowMissing: boolean, If set to true and the Database is not found, the request will succeed but no action will be taken.
   etag: string, The current etag of the Database. If an etag is provided and does not match the current etag of the database, deletion will be blocked and a FAILED_PRECONDITION error will be returned.
-  validateOnly: boolean, If set, validate the request and preview the response, but do not actually delete the database.
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format