Match spec for font-weight: bolder|lighter

Source/core/platform/graphics/FontDescription.cpp

Index: Source/core/platform/graphics/FontDescription.cpp
diff --git a/Source/core/platform/graphics/FontDescription.cpp b/Source/core/platform/graphics/FontDescription.cpp
index 89b57b283ae1072d0a8ecd70a43c2ad99659dbef..5b0f32cf25d09da10d78d139dc27e284e73cfdab 100644
--- a/Source/core/platform/graphics/FontDescription.cpp
+++ b/Source/core/platform/graphics/FontDescription.cpp
@@ -45,27 +45,19 @@ COMPILE_ASSERT(sizeof(FontDescription) == sizeof(SameSizeAsFontDescription), Fon
 
 FontWeight FontDescription::lighterWeight(void) const
 {
-    // FIXME: Should actually return the CSS weight corresponding to next lightest
-    // weight of the currently used font family.
     switch (m_weight) {
         case FontWeight100:
         case FontWeight200:
-            return FontWeight100;
-
         case FontWeight300:
-            return FontWeight200;
-
         case FontWeight400:
         case FontWeight500:
-            return FontWeight300;
+            return FontWeight100;
 
         case FontWeight600:
         case FontWeight700:
             return FontWeight400;
 
         case FontWeight800:
-            return FontWeight500;
-
         case FontWeight900:
             return FontWeight700;
     }
@@ -75,13 +67,9 @@ FontWeight FontDescription::lighterWeight(void) const
 
 FontWeight FontDescription::bolderWeight(void) const
 {
-    // FIXME: Should actually return the CSS weight corresponding to next heaviest
-    // weight of the currently used font family.
     switch (m_weight) {
         case FontWeight100:
         case FontWeight200:
-            return FontWeight300;
-
         case FontWeight300:
             return FontWeight400;
 
@@ -91,8 +79,6 @@ FontWeight FontDescription::bolderWeight(void) const
 
         case FontWeight600:
         case FontWeight700:
-            return FontWeight800;
-
         case FontWeight800:
         case FontWeight900:
             return FontWeight900;