Remove unused function at ui/compositor/layer.h

GetTargetTemperature seems not used.

Bug: None
Change-Id: Ib29a2ac861665eaba30c9ab10af483d8f5892a99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014350
Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734324}

AUTHORS

@@ -467,6 +467,7 @@ Jonathan Hacker <jhacker@arcanefour.com>
 Jongdeok Kim <jongdeok.kim@navercorp.com>
 Jongheon Kim <sapzape@gmail.com>
 JongKwon Lee <jongkwon.lee@navercorp.com>
+Jongmok Kim <jongmok.kim@navercorp.com>
 Jongsoo Lee <leejongsoo@gmail.com>
 Joone Hur <joone.hur@intel.com>
 Joonghun Park <pjh0718@gmail.com>

ui/compositor/layer.h

@@ -215,10 +215,6 @@ class COMPOSITOR_EXPORT Layer : public LayerAnimationDelegate,
   // the combined opacity of the parent.
   float GetCombinedOpacity() const;
 
-  // Returns the target color temperature if animator is running, or the current
-  // temperature otherwise.
-  float GetTargetTemperature() const;
-
   // Blur pixels by 3 * this amount in anything below the layer and visible
   // through the layer.
   float background_blur() const { return background_blur_sigma_; }