IDL compiler: Remove unused __all__ in __init__.py

__all__ has been misunderstood and unnecessarily defined.
Removes __all__ definitions.  We don't use |import *|.

Bug: 839389
Change-Id: I571600ad50c0d3ef20028efe7fe576cd1ef60762
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903183
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713378}

third_party/blink/renderer/bindings/scripts/bind_gen/__init__.py

@@ -51,8 +51,3 @@ _setup_clang_format()
 
 from .example import run_example
 from .interface import generate_interfaces
-
-__all__ = [
-    "generate_interfaces",
-    "run_example",
-]

third_party/blink/renderer/bindings/scripts/web_idl/__init__.py

@@ -52,20 +52,3 @@ def init(runtime_enabled_features_paths):
             runtime-enabled features ("runtime_enabled_features.json5").
     """
     RuntimeEnabledFeatures.init(filepaths=runtime_enabled_features_paths)
-
-
-__all__ = [
-    "AstGroup",
-    "CallbackFunction",
-    "CallbackInterface",
-    "Component",
-    "Database",
-    "Dictionary",
-    "Enumeration",
-    "IdlType",
-    "Interface",
-    "Namespace",
-    "Typedef",
-    "Union",
-    "build_database",
-]