Replace usage of WebVector::isEmpty with WebVector::empty().

third_party/WebKit/Source/web/tests/WebImageTest.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 58 matching lines @@
   SkAutoLockPixels autoLock2(images[1].getSkBitmap());
   EXPECT_EQ(SkColorSetARGB(255, 0, 0, 0),
             images[1].getSkBitmap().getColor(0, 0));
 }
 
 TEST(WebImageTest, ICOValidHeaderMissingBitmap) {
   RefPtr<SharedBuffer> data = readFile("valid_header_missing_bitmap.ico");
   ASSERT_TRUE(data.get());
 
   WebVector<WebImage> images = WebImage::framesFromData(WebData(data));
-  ASSERT_TRUE(images.isEmpty());
+  ASSERT_TRUE(images.empty());
 }
 
 TEST(WebImageTest, BadImage) {
   const char badImage[] = "hello world";
   WebVector<WebImage> images = WebImage::framesFromData(WebData(badImage));
   ASSERT_EQ(0u, images.size());
 
   WebImage image = WebImage::fromData(WebData(badImage), WebSize());
   EXPECT_TRUE(image.getSkBitmap().empty());
   EXPECT_TRUE(image.getSkBitmap().isNull());
 }
 
 }  // namespace blink