Remove more dead app list code.

ui/app_list/app_list_constants.cc

Index: ui/app_list/app_list_constants.cc
diff --git a/ui/app_list/app_list_constants.cc b/ui/app_list/app_list_constants.cc
index 0891e380e5fd0b27f08999ff381e3d85e0592bb4..9633deea6f1ffe33e8760fc43e53962ad4fd218c 100644
--- a/ui/app_list/app_list_constants.cc
+++ b/ui/app_list/app_list_constants.cc
@@ -14,13 +14,7 @@ const SkColor kSearchBoxBackground = SK_ColorWHITE;
 
 const SkColor kSearchTextColor = SkColorSetRGB(0x33, 0x33, 0x33);
 
-// In Windows, transparent background color will cause ugly text rendering,
-// therefore kContentsBackgroundColor should be used. See crbug.com/406989
-#if defined(OS_CHROMEOS)
 const SkColor kLabelBackgroundColor = SK_ColorTRANSPARENT;
-#else
-const SkColor kLabelBackgroundColor = kContentsBackgroundColor;
-#endif
 
 const SkColor kTopSeparatorColor = SkColorSetRGB(0xC0, 0xC0, 0xC0);
 const SkColor kBottomSeparatorColor = SkColorSetRGB(0xC0, 0xC0, 0xC0);
@@ -140,14 +134,6 @@ const char kSearchQueryLength[] = "Apps.AppListSearchQueryLength";
 const char kSearchResultDistanceFromOrigin[] =
     "Apps.AppListSearchResultDistanceFromOrigin";
 
-#if defined(OS_LINUX)
-#if defined(GOOGLE_CHROME_BUILD)
-const char kAppListWMClass[] = "chrome_app_list";
-#else  // CHROMIUM_BUILD
-const char kAppListWMClass[] = "chromium_app_list";
-#endif
-#endif
-
 gfx::ShadowValue GetShadowForZHeight(int z_height) {
   if (z_height <= 0)
     return gfx::ShadowValue();