Organize security panel main view.

Source/devtools/front_end/security/lockIcon.css

Index: Source/devtools/front_end/security/lockIcon.css
diff --git a/Source/devtools/front_end/security/lockIcon.css b/Source/devtools/front_end/security/lockIcon.css
index 9813ea4e9529c88da43e5d0448a435461599c27e..1af6749623c966b54fe2a2b1e9eaab9af457fe3f 100644
--- a/Source/devtools/front_end/security/lockIcon.css
+++ b/Source/devtools/front_end/security/lockIcon.css
@@ -11,46 +11,19 @@
 }
 
 .lock-icon-unknown {
-    background-image: url(Images/securityStateNeutral.png);
+    background-image: url(Images/securityStateNeutral.svg);
 }
 
 .lock-icon-neutral {
-    background-image: url(Images/securityStateNeutral.png);
+    background-image: url(Images/securityStateNeutral.svg);
 }
 
 .lock-icon-insecure {
-    background-image: url(Images/securityStateInsecure.png);
-}
-
-.lock-icon-warning {
-    background-image: url(Images/securityStateWarning.png);
+    background-image: url(Images/securityStateInsecure.svg);
 }
 
 .lock-icon-secure {
-    background-image: url(Images/securityStateSecure.png);
-}
-
-
-@media (-webkit-min-device-pixel-ratio: 1.5) {
-    .lock-icon-unknown {
-        background-image: url(Images/securityStateNeutral_2x.png);
-    }
-
-    .lock-icon-neutral {
-        background-image: url(Images/securityStateNeutral_2x.png);
-    }
-
-    .lock-icon-insecure {
-        background-image: url(Images/securityStateInsecure_2x.png);
-    }
-
-    .lock-icon-warning {
-        background-image: url(Images/securityStateWarning_2x.png);
-    }
-
-    .lock-icon-secure {
-        background-image: url(Images/securityStateSecure_2x.png);
-    }
+    background-image: url(Images/securityStateSecure.svg);
 }
 
 .security-property-insecure {