DevTools protocol: Fix typo in CSS.getStyleSheetText

Change-Id: If64e6f5fc245da7d9bbb8d3925d004b545338b0a
Reviewed-on: https://chromium-review.googlesource.com/993477
Commit-Queue: Paul Irish <paulirish@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550715}

third_party/blink/renderer/core/inspector/browser_protocol.json

@@ -2149,7 +2149,7 @@
                 },
                 {
                     "name": "getStyleSheetText",
-                    "description": "Returns the current textual content and the URL for a stylesheet.",
+                    "description": "Returns the current textual content for a stylesheet.",
                     "parameters": [
                         {
                             "name": "styleSheetId",

third_party/blink/renderer/core/inspector/browser_protocol.pdl

@@ -983,7 +983,7 @@ experimental domain CSS
       # Usage statistics for every employed platform font.
       array of PlatformFontUsage fonts
 
-  # Returns the current textual content and the URL for a stylesheet.
+  # Returns the current textual content for a stylesheet.
   command getStyleSheetText
     parameters
       StyleSheetId styleSheetId