WebShare: Fixed the API occasionally breaking on a particular page.

chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
index 110ce20bf50d2840001ec7ad3a5c2f579ed48566..e4c905b5efef4e98068a3e9cae9a5d4257b6a50f 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
@@ -43,6 +43,10 @@ public class ShareServiceImpl implements ShareService {
             public void onTargetChosen(ComponentName chosenComponent) {
                 callback.call(null);
             }
+
+            public void onCancel() {
+                callback.call("Share canceled");
+            }
         };
 
         ShareHelper.share(false, false, mActivity, title, text, null, null, null, innerCallback);