Use StrictTypeChecking for ImageBitmap

Source/modules/imagebitmap/ImageBitmapFactories.cpp

Index: Source/modules/imagebitmap/ImageBitmapFactories.cpp
diff --git a/Source/modules/imagebitmap/ImageBitmapFactories.cpp b/Source/modules/imagebitmap/ImageBitmapFactories.cpp
index 386c5ba8b1851d7a5fad908a0d745ac2d2e9faf9..16fd2c2068869a73fa0057dee4ab1f5fcdc9865f 100644
--- a/Source/modules/imagebitmap/ImageBitmapFactories.cpp
+++ b/Source/modules/imagebitmap/ImageBitmapFactories.cpp
@@ -88,10 +88,6 @@ ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget,
     // This variant does not work in worker threads.
     ASSERT(eventTarget.toDOMWindow());
 
-    if (!image) {
-        exceptionState.throwTypeError("The image element provided is invalid.");
-        return ScriptPromise();
-    }
     if (!image->cachedImage()) {
         exceptionState.throwDOMException(InvalidStateError, "No image can be retrieved from the provided element.");
         return ScriptPromise();
@@ -127,10 +123,6 @@ ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget,
     // This variant does not work in worker threads.
     ASSERT(eventTarget.toDOMWindow());
 
-    if (!video) {
-        exceptionState.throwTypeError("The video element provided is invalid.");
-        return ScriptPromise();
-    }
     if (!video->player()) {
         exceptionState.throwDOMException(InvalidStateError, "No player can be retrieved from the provided video element.");
         return ScriptPromise();
@@ -179,10 +171,6 @@ ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget,
     // This variant does not work in worker threads.
     ASSERT(eventTarget.toDOMWindow());
 
-    if (!canvas) {
-        exceptionState.throwTypeError("The canvas element provided is invalid.");
-        return ScriptPromise();
-    }
     if (!canvas->originClean()) {
         exceptionState.throwSecurityError("The canvas element provided is tainted with cross-origin data.");
         return ScriptPromise();
@@ -198,10 +186,6 @@ ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget,
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget, Blob* blob, ExceptionState& exceptionState)
 {
-    if (!blob) {
-        exceptionState.throwTypeError("The blob provided is invalid.");
-        return ScriptPromise();
-    }
     RefPtr<ImageBitmapLoader> loader = ImageBitmapFactories::ImageBitmapLoader::create(from(eventTarget), eventTarget.executionContext(), IntRect());
     ScriptPromise promise = loader->promise();
     from(eventTarget).addLoader(loader);
@@ -211,10 +195,6 @@ ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget,
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget, Blob* blob, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
 {
-    if (!blob) {
-        exceptionState.throwTypeError("The blob provided is invalid.");
-        return ScriptPromise();
-    }
     if (!sw || !sh) {
         exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
         return ScriptPromise();
@@ -233,10 +213,6 @@ ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget,
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget, ImageData* data, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
 {
-    if (!data) {
-        exceptionState.throwTypeError("The ImageData provided is invalid.");
-        return ScriptPromise();
-    }
     if (!sw || !sh) {
         exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
         return ScriptPromise();
@@ -252,10 +228,6 @@ ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget,
 
 ScriptPromise ImageBitmapFactories::createImageBitmap(EventTarget& eventTarget, ImageBitmap* bitmap, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
 {
-    if (!bitmap) {
-        exceptionState.throwTypeError("The ImageBitmap provided is invalid.");
-        return ScriptPromise();
-    }
     if (!sw || !sh) {
         exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
         return ScriptPromise();