Refactor Android printing code to make it more testable.

printing/android/java/src/org/chromium/printing/PrintingController.java

Index: printing/android/java/src/org/chromium/printing/PrintingController.java
diff --git a/printing/android/java/src/org/chromium/printing/PrintingController.java b/printing/android/java/src/org/chromium/printing/PrintingController.java
index beed86b335db232ba3325c7cb8c30839832dc403..76a2e5ac4b713a7c1bac7e8ab3a27a0cb9b4c570 100644
--- a/printing/android/java/src/org/chromium/printing/PrintingController.java
+++ b/printing/android/java/src/org/chromium/printing/PrintingController.java
@@ -62,7 +62,7 @@ public interface PrintingController {
     void pageCountEstimationDone(final int maxPages);
 
     /**
-     * Sets PrintingContext.
+     * Sets PrintingContext currently associated with the controller.
      *
      * This needs to be called after PrintingContext object is created. Firstly its native
      * counterpart is created, and then the Java.  PrintingController implementation
@@ -71,14 +71,6 @@ public interface PrintingController {
     void setPrintingContext(final PrintingContextInterface printingContext);
 
     /**
-     * TODO(cimamoglu): Remove errorText stuff once KitKat is public and we can move this code.
-     * @param errorText The error message to be shown to user in case something goes wrong in PDF
-     *                  generation in Chromium.  We pass it here as a string because this folder
-     *                  cannot use resources directly (or any other Clank code).
-     */
-    void setErrorText(final String errorText);
-
-    /**
      * @return Whether a complete PDF generation cycle inside Chromium has been completed.
      */
     boolean hasPrintingFinished();