color: Add ColorCanvasExtensions runtime flag

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 209f3d0afa9ac1a4a3b0145c81dac28b3ed46ae6..7e5f3f3f2f3cfb01f5324eca558e9f683e4eefd2 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -353,13 +353,6 @@ const char kEnableBlinkFeatures[]           = "enable-blink-features";
 // PlzNavigate: Use the experimental browser-side navigation path.
 const char kEnableBrowserSideNavigation[]   = "enable-browser-side-navigation";
 
-// Changes the behavior of the "default" color space conversion mode in
-// createImageBitmap. When enabled without the kEnableColorCorrectRendering
-// flag, "default" means color correct the image bitmap to the display color
-// space.
-const char kEnableColorCorrectRenderingDefaultMode[] =
-    "enable-color-correct-rendering-default-mode";
-
 // Enables display list based 2d canvas implementation. Options:
 //  1. Enable: allow browser to use display list for 2d canvas (browser makes
 //     decision).