Remove optional type="JavaScript" from script tags

http://www.whatwg.org/specs/web-apps/current-work/#attr-script-type

  The type attribute gives the language of the script or format of the
  data. If the attribute is present, its value must be a valid MIME
  type. The charset parameter must not be specified. The default,
  which is used if the attribute is absent, is "text/javascript"."

Blink is less strict than other browsers. Removing the optional type
attribute enables tests to be run in other browsers, notably Firefox.

BUG=308992
NOTRY=true

Review URL: https://codereview.chromium.org/209333007

git-svn-id: svn://svn.chromium.org/blink/trunk@169872 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/svg/custom/absolute-sized-content-with-resources.xhtml

@@ -25,7 +25,7 @@
         </g>
         </svg>
     </div>
-    <script type="JavaScript">
+    <script>
         function repaintTest() {
             document.getElementById("contentBox").style.setProperty("width", "400px");
         }

third_party/WebKit/LayoutTests/svg/custom/relative-sized-content-with-resources.xhtml

@@ -16,7 +16,7 @@
              <circle cx="50%" cy="50%" r="40%" stroke="gray" fill="url(#grad)"/>
         </svg>
     </div>
-    <script type="JavaScript">
+    <script>
         function repaintTest() {
             document.getElementById("contentBox").style.setProperty("width", "400px");
         }

third_party/WebKit/LayoutTests/svg/custom/relative-sized-content.xhtml

@@ -9,7 +9,7 @@
             <rect id="targetRect" width="100%" height="100%" fill="blue"/>
         </svg>
     </div>
-    <script type="JavaScript">
+    <script>
         function repaintTest() {
             document.getElementById("contentBox").style.setProperty("width", "400px");
         }

third_party/WebKit/LayoutTests/svg/custom/relative-sized-image.xhtml

@@ -9,7 +9,7 @@
             <image xlink:href="../W3C-SVG-1.1/resources/smiley.png" width="100%" height="100%" preserveAspectRatio="none"/>
         </svg>
     </div>
-    <script type="JavaScript">
+    <script>
         function repaintTest() {
             document.getElementById("contentBox").style.setProperty("width", "400px");
         }