Standardize license headers

Many of the license headers were incorrect or corrupted. To prepare for
a check that verifies correct license headers are added to source code,
we should fix up the existing license headers to use the correct format.

The license headers that include non-Google/non-Chromium authors are
left as-is.

Change-Id: Iab9bdc41d815ac7ab07ccacf44818f3b56a75230
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2016745
Commit-Queue: Tim van der Lippe <[email protected]>
Reviewed-by: Benedikt Meurer <[email protected]>
diff --git a/front_end/ui/SplitWidget.js b/front_end/ui/SplitWidget.js
index 652bc87..b867b07 100644
--- a/front_end/ui/SplitWidget.js
+++ b/front_end/ui/SplitWidget.js
@@ -5,19 +5,21 @@
  * modification, are permitted provided that the following conditions are
  * met:
  *
- * 1. Redistributions of source code must retain the above copyright
+ *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above
+ *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
  *
- * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC.
- * OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY