bindings: Stop using forward declarations for typed array in union containers

Typed arrays in blink (e.g. DOMFloat32Array) are typedef of DOMTypedArray<T, U>
so using forward declarations causes conflicts. Stop using forward
declarations for typed arrays in union containers. Instead, include
headers directly.

BUG=671755

Review-Url: https://codereview.chromium.org/2559323004
Cr-Commit-Position: refs/heads/master@{#437717}

third_party/WebKit/Source/bindings/scripts/v8_union.py

@@ -121,7 +121,7 @@ def _update_includes_and_forward_decls(member, interface_info):
         cpp_includes.update(interface_info.get(
             'dependencies_include_paths', []))
         # We need complete types for IDL dictionaries in union containers.
-        if member.is_dictionary:
+        if member.is_dictionary or member.is_typed_array:
             header_includes.update(member.includes_for_type())
         else:
             cpp_includes.update(member.includes_for_type())

third_party/WebKit/Source/bindings/tests/results/core/TestInterface2OrUint8Array.cpp

@@ -9,10 +9,7 @@
 #include "TestInterface2OrUint8Array.h"
 
 #include "bindings/core/v8/ToV8.h"
-#include "bindings/core/v8/V8ArrayBufferView.h"
 #include "bindings/core/v8/V8TestInterface2.h"
-#include "bindings/core/v8/V8Uint8Array.h"
-#include "core/dom/FlexibleArrayBufferView.h"
 
 namespace blink {
 

third_party/WebKit/Source/bindings/tests/results/core/TestInterface2OrUint8Array.h

@@ -11,13 +11,15 @@
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/V8ArrayBufferView.h"
 #include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8Uint8Array.h"
 #include "core/CoreExport.h"
+#include "core/dom/FlexibleArrayBufferView.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-class DOMUint8Array;
 class TestInterface2;
 
 class CORE_EXPORT TestInterface2OrUint8Array final {