Update files to use SK_BUILD_FOR_ANDROID.

This CL also removes any unecessary references to
the ANDROID definition.
Review URL: http://codereview.appspot.com/5354049

git-svn-id: http://skia.googlecode.com/svn/trunk@2629 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index aeb71ad..17778fb 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -1041,7 +1041,7 @@
         SkPDFDocument doc;
         SkPDFDevice* device = static_cast<SkPDFDevice*>(fPdfCanvas->getDevice());
         doc.appendPage(device);
-#ifdef ANDROID
+#ifdef SK_BUILD_FOR_ANDROID
         name.prepend("/sdcard/");
 #endif
         
@@ -1787,7 +1787,7 @@
     fZoomCenterX = SkScalarHalf(this->width());
     fZoomCenterY = SkScalarHalf(this->height());
 
-#ifdef ANDROID
+#ifdef SK_BUILD_FOR_ANDROID
     // FIXME: The first draw after a size change does not work on Android, so
     // we post an invalidate.
     this->postInvalDelay();