Remove unused ImageQualityController friends and includes

This patch removes the following unused test friend:
    FRIEND_TEST_ALL_PREFIXES(
        ImageQualityControllerTest, LowQualityFilterForLiveResize);

In addition, several unused includes have been removed.

BUG=604462

Review URL: https://codereview.chromium.org/1897043003

Cr-Commit-Position: refs/heads/master@{#388570}

third_party/WebKit/Source/core/layout/ImageQualityController.h

@@ -32,13 +32,8 @@
 #define ImageQualityController_h
 
 #include "base/gtest_prod_util.h"
-#include "core/CoreExport.h"
 #include "core/layout/LayoutObject.h"
-#include "platform/geometry/IntSize.h"
 #include "platform/geometry/LayoutSize.h"
-#include "platform/graphics/Image.h"
-#include "platform/graphics/ImageOrientation.h"
-#include "platform/graphics/ImageSource.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
@@ -87,7 +82,6 @@ private:
     FRIEND_TEST_ALL_PREFIXES(LayoutPartTest, DestroyUpdatesImageQualityController);
 
     // For calling setTimer(),
-    FRIEND_TEST_ALL_PREFIXES(ImageQualityControllerTest, LowQualityFilterForLiveResize);
     FRIEND_TEST_ALL_PREFIXES(ImageQualityControllerTest, LowQualityFilterForResizingImage);
     FRIEND_TEST_ALL_PREFIXES(ImageQualityControllerTest, MediumQualityFilterForNotAnimatedWhileAnotherAnimates);
     FRIEND_TEST_ALL_PREFIXES(ImageQualityControllerTest, DontKickTheAnimationTimerWhenPaintingAtTheSameSize);