[DevTools] Handle valid urls with quotes inside them in SSP.

third_party/WebKit/LayoutTests/inspector/elements/styles-2/inject-stylesheet-expected.txt

 CONSOLE MESSAGE: line 10: iframe loaded
 Tests that injected user stylesheets are reflected in the Styles pane.
 
 
 Main frame style:
 background-attachment: scroll;
     initial - #main inject-stylesheet.html:5 -> inject-stylesheet.html:5:3
 background-clip: border-box;
     initial - #main inject-stylesheet.html:5 -> inject-stylesheet.html:5:3
 background-color: rgb(0, 0, 255);
     blue - #main inject-stylesheet.html:5 -> inject-stylesheet.html:5:3
 background-image: none;
     initial - #main inject-stylesheet.html:5 -> inject-stylesheet.html:5:3
 background-origin: padding-box;
     initial - #main inject-stylesheet.html:5 -> inject-stylesheet.html:5:3
 background-size: auto;
     initial - #main inject-stylesheet.html:5 -> inject-stylesheet.html:5:3
 border-bottom-style: solid;
     solid - #main injected stylesheet
 border-left-style: solid;
     solid - #main injected stylesheet
 border-right-style: solid;
     solid - #main injected stylesheet
 border-top-style: solid;
     solid - #main injected stylesheet
 color: rgb(255, 0, 0);
     red - #main injected stylesheet
 display: block;
     block - div user agent stylesheet
--webkit-border-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAAiElE…s+LS30CAhBN5nNxeT5hbJ1zwmji2k+aF6NENIPf/hs54f0sZFUVAMigAAAABJRU5ErkJggg==") 100% / 1 / 0px stretch;
-    url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAAiElE…s+LS30CAhBN5nNxeT5hbJ1zwmji2k+aF6NENIPf/hs54f0sZFUVAMigAAAABJRU5ErkJggg==") - #main injected stylesheet
+-webkit-border-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAAiElEQ…Ms+LS30CAhBN5nNxeT5hbJ1zwmji2k+aF6NENIPf/hs54f0sZFUVAMigAAAABJRU5ErkJggg==) 100% / 1 / 0px stretch;
+    url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAAiElEQ…Ms+LS30CAhBN5nNxeT5hbJ1zwmji2k+aF6NENIPf/hs54f0sZFUVAMigAAAABJRU5ErkJggg==) - #main injected stylesheet
 [expanded] 
 element.style { ()
 
 [expanded] 
 #main { (inject-stylesheet.html:5 -> inject-stylesheet.html:5:3)
     background: blue;
         background-image: initial;
         background-position-x: initial;
         background-position-y: initial;
         background-size: initial;
         background-repeat-x: initial;
         background-repeat-y: initial;
         background-attachment: initial;
         background-origin: initial;
         background-clip: initial;
         background-color: blue;
 
 [expanded] 
 #main { (injected stylesheet)
     color: red;
-    -webkit-border-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAAiElE…s+LS30CAhBN5nNxeT5hbJ1zwmji2k+aF6NENIPf/hs54f0sZFUVAMigAAAABJRU5ErkJggg==");
+    -webkit-border-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAAiElEQ…Ms+LS30CAhBN5nNxeT5hbJ1zwmji2k+aF6NENIPf/hs54f0sZFUVAMigAAAABJRU5ErkJggg==);
     border-style: solid;
         border-top-style: solid;
         border-right-style: solid;
         border-bottom-style: solid;
         border-left-style: solid;
 
 [expanded] 
 div { (user agent stylesheet)
     display: block;
 
@@ skipping 60 matching lines @@
 [expanded] 
 body { (user agent stylesheet)
     display: block;
     margin: 8px;
         margin-top: 8px;
         margin-right: 8px;
         margin-bottom: 8px;
         margin-left: 8px;