When onPageFinished calls onNewPicture, pass null picture on SDK>=JB MR2.

android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java

Index: android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java
diff --git a/android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java b/android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java
index 4a3892673442c2b9ec08979ddb21ba8d4649b45a..bfe5e6a87a3bc432b3b6c734769a470f8d8c3ec3 100644
--- a/android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java
+++ b/android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java
@@ -406,7 +406,7 @@ class WebViewChromium implements WebViewProvider, WebViewProvider.ScrollDelegate
         // Make sure that we do not trigger any callbacks after destruction
         mContentsClientAdapter.setWebChromeClient(null);
         mContentsClientAdapter.setWebViewClient(null);
-        mContentsClientAdapter.setPictureListener(null);
+        mContentsClientAdapter.setPictureListener(null, true);
         mContentsClientAdapter.setFindListener(null);
         mContentsClientAdapter.setDownloadListener(null);
 
@@ -1294,9 +1294,9 @@ class WebViewChromium implements WebViewProvider, WebViewProvider.ScrollDelegate
             });
             return;
         }
-        mContentsClientAdapter.setPictureListener(listener);
-        mAwContents.enableOnNewPicture(
-                listener != null, mAppTargetSdkVersion >= Build.VERSION_CODES.JELLY_BEAN_MR2);
+        boolean invalidateOnly = mAppTargetSdkVersion >= Build.VERSION_CODES.JELLY_BEAN_MR2;
+        mContentsClientAdapter.setPictureListener(listener, invalidateOnly);
+        mAwContents.enableOnNewPicture(listener != null, invalidateOnly);
     }
 
     @Override