Fix SVGImageChromeClient::scheduleAnimation() crash.

Source/core/svg/graphics/SVGImageChromeClient.cpp

Index: Source/core/svg/graphics/SVGImageChromeClient.cpp
diff --git a/Source/core/svg/graphics/SVGImageChromeClient.cpp b/Source/core/svg/graphics/SVGImageChromeClient.cpp
index ecbe952bb0b06272c6d75f7083711d1a385f9fab..a3b69881f8af05d4304b25283d238c67f7707534 100644
--- a/Source/core/svg/graphics/SVGImageChromeClient.cpp
+++ b/Source/core/svg/graphics/SVGImageChromeClient.cpp
@@ -63,6 +63,9 @@ void SVGImageChromeClient::invalidateContentsAndRootView(const IntRect& r)
 
 void SVGImageChromeClient::scheduleAnimation()
 {
+    if (!m_image)
+        return;
+
     // Because a single SVGImage can be shared by multiple pages, we can't key
     // our svg image layout on the page's real animation frame. Therefore, we
     // run this fake animation timer to trigger layout in SVGImages. The name,