Remove IgnorableExceptionState

IgnorableExceptionState is equivalent to DummyExceptionStateForTesting.
We should just use DummyExceptionStateForTesting.

BUG=

Review-Url: https://codereview.chromium.org/2614013003
Cr-Commit-Position: refs/heads/master@{#441871}

third_party/WebKit/Source/bindings/core/v8/ExceptionState.h

@@ -187,13 +187,13 @@ class CORE_EXPORT DummyExceptionStateForTesting final : public ExceptionState {
       clearException();
     }
   }
-
   void throwDOMException(ExceptionCode, const String& message) override;
   void throwTypeError(const String& message) override;
   void throwSecurityError(const String& sanitizedMessage,
                           const String& unsanitizedMessage) override;
   void throwRangeError(const String& message) override;
   void rethrowV8Exception(v8::Local<v8::Value>) override;
+  ExceptionState& returnThis() { return *this; }
 };
 
 }  // namespace blink

third_party/WebKit/Source/bindings/core/v8/ExceptionStatePlaceholder.h

@@ -38,27 +38,7 @@
 
 namespace blink {
 
-class IgnorableExceptionState final : public ExceptionState {
-  WTF_MAKE_NONCOPYABLE(IgnorableExceptionState);
-
- public:
-  IgnorableExceptionState()
-      : ExceptionState(nullptr,
-                       ExceptionState::UnknownContext,
-                       nullptr,
-                       nullptr) {}
-
-  ExceptionState& returnThis() { return *this; }
-
-  void throwDOMException(ExceptionCode, const String& message) override {}
-  void throwRangeError(const String& message) override{};
-  void throwSecurityError(const String& sanitizedMessage,
-                          const String& unsanitizedMessage) override {}
-  void throwTypeError(const String& message) override {}
-  void rethrowV8Exception(v8::Local<v8::Value>) override{};
-};
-
-#define IGNORE_EXCEPTION (::blink::IgnorableExceptionState().returnThis())
+#define IGNORE_EXCEPTION (::blink::DummyExceptionStateForTesting().returnThis())
 
 #if ENABLE(ASSERT)
 
@@ -88,7 +68,8 @@ class CORE_EXPORT NoExceptionStateAssertionChecker final
 
 #else
 
-#define ASSERT_NO_EXCEPTION (::blink::IgnorableExceptionState().returnThis())
+#define ASSERT_NO_EXCEPTION \
+  (::blink::DummyExceptionStateForTesting().returnThis())
 
 #endif
 

third_party/WebKit/Source/core/dom/IntersectionObserver.cpp

@@ -210,7 +210,7 @@ IntersectionObserver::IntersectionObserver(
 void IntersectionObserver::clearWeakMembers(Visitor* visitor) {
   if (ThreadHeap::isHeapObjectAlive(root()))
     return;
-  IgnorableExceptionState exceptionState;
+  DummyExceptionStateForTesting exceptionState;
   disconnect(exceptionState);
   m_root = nullptr;
 }