Revert "opt Chromium back into HQ scaling clamps"

This reverts commit 58525850.

Reason for revert: Broke fast/webgl/texImage-imageBitmap-from-image-resize.html on Mac 10.11:
https://ci.chromium.org/buildbot/chromium.mac/Mac10.11%20Tests/23254

Original change's description:
> opt Chromium back into HQ scaling clamps
> 
> Change-Id: I2693be780057c1ba715fce3ae3c398c536f147ea
> Reviewed-on: https://chromium-review.googlesource.com/911734
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#536009}

TBR=fmalita@chromium.org,brianosman@google.com,mtklein@chromium.org

Change-Id: I01d68484de5892eeab4c1ec42e389ab8c0fdbde7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/912471Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536041}

skia/config/SkUserConfig.h

@@ -216,10 +216,6 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_SUPPORT_LEGACY_DASH_CULL_PATH
 #endif
 
-#ifndef SK_LEGACY_HIGH_QUALITY_SCALING_CLAMP
-#define SK_LEGACY_HIGH_QUALITY_SCALING_CLAMP
-#endif
-
 // Max. verb count for paths rendered by the edge-AA tessellating path renderer.
 #define GR_AA_TESSELLATOR_MAX_VERB_COUNT 10