Remove unused method definitions of V8PrivateProperty

IntersectionObserver and MutationObserver are no more private properties and do not use the functions generated by the macro V8_PRIVATE_PROPERTY_GETTER_NAME. However, they are registered as private properties in the macro V8_PRIVATE_PROPERTY_FOR_EACH.

This CL cleans up the macro V8_PRIVATE_PROPERTY_FOR_EACH by deleting the registerations.

Bug: 715418
Change-Id: Id3c4b553446a942c96a6c5fedf4678518e0facf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868752Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Marina Sakai <marinasakai@google.com>
Cr-Commit-Position: refs/heads/master@{#707724}

third_party/blink/renderer/platform/bindings/v8_private_property.h

@@ -36,11 +36,9 @@ class ScriptWrappable;
   X(DOMException, Error)                                \
   X(Global, Event)                                      \
   X(IDBCursor, Request)                                 \
-  X(IntersectionObserver, Callback)                     \
   X(MessageChannel, Port1)                              \
   X(MessageChannel, Port2)                              \
   X(MessageEvent, CachedData)                           \
-  X(MutationObserver, Callback)                         \
   X(NamedConstructor, Initialized)                      \
   X(PopStateEvent, State)                               \
   X(SameObject, DetectedBarcodeCornerPoints)            \