Fix regression where some apis were registered, but didn't exist.

chrome/common/extensions/docs/server2/schema_processor.py

Index: chrome/common/extensions/docs/server2/schema_processor.py
diff --git a/chrome/common/extensions/docs/server2/schema_processor.py b/chrome/common/extensions/docs/server2/schema_processor.py
index 836f1a51d8bfc665e8edcbc319c40af0546e7219..af0cdd70a2a74824fb309551f784e2610df74893 100644
--- a/chrome/common/extensions/docs/server2/schema_processor.py
+++ b/chrome/common/extensions/docs/server2/schema_processor.py
@@ -126,7 +126,10 @@ class SchemaProcessor(object):
 
     api_features = self._features_bundle.GetAPIFeatures().Get()
     # We don't want to inline the events API, as it's handled differently
-    if schema.get('namespace', '') != 'events':
+    # Also, the webviewTag API is handled differently, as it only exists
+    # for the purpose of documentation, it's not a true internal api
+    namespace = schema.get('namespace', '')
+    if namespace != 'events' and namespace != 'webviewTag':
       internal_api = api_features.get(schema.get('namespace', ''), {}).get(
           'internal', False)