Remove OS(WINCE) as blink and chromium does not support WinCe.

Source/core/platform/graphics/BitmapImage.cpp

Index: Source/core/platform/graphics/BitmapImage.cpp
diff --git a/Source/core/platform/graphics/BitmapImage.cpp b/Source/core/platform/graphics/BitmapImage.cpp
index 0e7e1c3528f4ccd51ffbb7dbb2bd3ae7b64ca555..37805897996083b090e2dee9e323d53c75bebe30 100644
--- a/Source/core/platform/graphics/BitmapImage.cpp
+++ b/Source/core/platform/graphics/BitmapImage.cpp
@@ -560,11 +560,7 @@ bool BitmapImage::mayFillWithSolidColor()
 {
     if (!m_checkedForSolidColor && frameCount() > 0) {
         checkForSolidColor();
-        // WINCE PORT: checkForSolidColor() doesn't set m_checkedForSolidColor until
-        // it gets enough information to make final decision.
-#if !OS(WINCE)
         ASSERT(m_checkedForSolidColor);
-#endif
     }
     return m_isSolidColor && !m_currentFrame;
 }