clang/blink_gc_plugin: Replace 'WebCore' with 'blink'

tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp

Index: tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
diff --git a/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp b/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
index d1d3a468ec88b1af5cdd8d145716e059d8239862..43fbcf83d5fe1ab6bb1e45edf5b44f7e3c970300 100644
--- a/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
+++ b/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
@@ -574,9 +574,9 @@ class BlinkGCPluginConsumer : public ASTConsumer {
         options_(options),
         json_(0) {
 
-    // Only check structures in the blink, WebCore and WebKit namespaces.
+    // Only check structures in the blink, blink and WebKit namespaces.
+    options_.checked_namespaces.insert("blink");
     options_.checked_namespaces.insert("blink");
-    options_.checked_namespaces.insert("WebCore");
     options_.checked_namespaces.insert("WebKit");
 
     // Ignore GC implementation files.