blimp: Fix for multiple show IME messages

blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/input/ImeHelperDialog.java

Index: blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/input/ImeHelperDialog.java
diff --git a/blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/input/ImeHelperDialog.java b/blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/input/ImeHelperDialog.java
index b33985c4c54e3a249820b620c8bc527be2d73bb2..b27e24f953445256c3ca644e772dfcf351f6d68c 100644
--- a/blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/input/ImeHelperDialog.java
+++ b/blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/input/ImeHelperDialog.java
@@ -68,6 +68,10 @@ public class ImeHelperDialog {
 
     @CalledByNative
     private void onShowImeRequested(int inputType, String text) {
+        if (mAlertDialog != null && mAlertDialog.isShowing()) {
+            mAlertDialog.dismiss();
+        }
+
         createTextInputPopup(inputType, text);
     }