Remove GC_PLUGIN_IGNORE for fixed bug from Blink's v8 serialization code.

BUG=644725

Change-Id: I37cefb2eedbf8d1771413eb0b5f70370ed7de9dd
Reviewed-on: https://chromium-review.googlesource.com/531671Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478816}

third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueDeserializer.h

@@ -26,8 +26,8 @@ class File;
 //
 // A deserializer cannot be used multiple times; it is expected that its
 // deserialize method will be invoked exactly once.
-class GC_PLUGIN_IGNORE("https://crbug.com/644725") CORE_EXPORT
-    V8ScriptValueDeserializer : public v8::ValueDeserializer::Delegate {
+class CORE_EXPORT V8ScriptValueDeserializer
+    : public v8::ValueDeserializer::Delegate {
   STACK_ALLOCATED();
   WTF_MAKE_NONCOPYABLE(V8ScriptValueDeserializer);
 

third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializer.h

@@ -28,8 +28,8 @@ class Transferables;
 //
 // A serializer cannot be used multiple times; it is expected that its serialize
 // method will be invoked exactly once.
-class GC_PLUGIN_IGNORE("https://crbug.com/644725")
-    CORE_EXPORT V8ScriptValueSerializer : public v8::ValueSerializer::Delegate {
+class CORE_EXPORT V8ScriptValueSerializer
+    : public v8::ValueSerializer::Delegate {
   STACK_ALLOCATED();
   WTF_MAKE_NONCOPYABLE(V8ScriptValueSerializer);