Remove support for the web manifest icon density member.

content/public/common/manifest.h

Index: content/public/common/manifest.h
diff --git a/content/public/common/manifest.h b/content/public/common/manifest.h
index 7dc15ca5167b0883b2a5d803c1c135152fbc2aed..df693f7cb6c91d128329c0655f3b833e3cace8dc 100644
--- a/content/public/common/manifest.h
+++ b/content/public/common/manifest.h
@@ -40,15 +40,9 @@ struct CONTENT_EXPORT Manifest {
     // supported type.
     base::NullableString16 type;
 
-    // Default value is 1.0 if the value is missing or invalid.
-    double density;
-
     // Empty if the parsing failed, the field was not present or empty.
     // The special value "any" is represented by gfx::Size(0, 0).
     std::vector<gfx::Size> sizes;
-
-    // Default density. Set to 1.0.
-    static const double kDefaultDensity;
   };
 
   // Structure representing a related application.