Remove unnecessary 'const's

Source/platform/graphics/GraphicsContext.cpp

Index: Source/platform/graphics/GraphicsContext.cpp
diff --git a/Source/platform/graphics/GraphicsContext.cpp b/Source/platform/graphics/GraphicsContext.cpp
index 85d38bff20eab2d940e3755af6c68d7a80bbae4f..c5630dbc176922175b8769a914f4f3891f49cd82 100644
--- a/Source/platform/graphics/GraphicsContext.cpp
+++ b/Source/platform/graphics/GraphicsContext.cpp
@@ -1883,7 +1883,7 @@ void GraphicsContext::draw1xMarker(SkBitmap* bitmap, int index)
     }
 }
 
-const SkPMColor GraphicsContext::lineColors(int index)
+SkPMColor GraphicsContext::lineColors(int index)
 {
     static const SkPMColor colors[] = {
         SkPreMultiplyARGB(0xFF, 0xFF, 0x00, 0x00), // Opaque red.
@@ -1893,7 +1893,7 @@ const SkPMColor GraphicsContext::lineColors(int index)
     return colors[index];
 }
 
-const SkPMColor GraphicsContext::antiColors1(int index)
+SkPMColor GraphicsContext::antiColors1(int index)
 {
     static const SkPMColor colors[] = {
         SkPreMultiplyARGB(0xB0, 0xFF, 0x00, 0x00), // Semitransparent red.
@@ -1903,7 +1903,7 @@ const SkPMColor GraphicsContext::antiColors1(int index)
     return colors[index];
 }
 
-const SkPMColor GraphicsContext::antiColors2(int index)
+SkPMColor GraphicsContext::antiColors2(int index)
 {
     static const SkPMColor colors[] = {
         SkPreMultiplyARGB(0x60, 0xFF, 0x00, 0x00), // More transparent red