DevTools: generate string16-based handlers for v8_inspector.

third_party/WebKit/LayoutTests/inspector-protocol/css/css-set-multiple-style-texts-expected.txt

 The test verifies functionality of protocol method CSS.setStyleTexts.
 
 ==== Initial style sheet text ====
 #test {
     box-sizing: border-box;
 }
 
 #test {
     /* resetting some properties */
     line-height: 1;
     font-family: "Arial";
     color: blue;
     display: flex; /* flex FTW! */
 }
 
 @media (min-width: 1px) {
     #test {
         font-size: 200%;
     }
 
     #test {
     }
 }
 
 
 
 Running test: testMalformedArguments1
-Expected protocol error: Some arguments of method 'CSS.setStyleTexts' can't be processed (edits.[1].styleSheetId: string value expected)
+Expected protocol error: Invalid request (edits.[1].styleSheetId: string value expected)
 
 Running test: testMalformedArguments2
-Expected protocol error: Some arguments of method 'CSS.setStyleTexts' can't be processed (edits.[0].range: object expected; edits.[0].text: string value expected; edits.[2].styleSheetId: string value expected)
+Expected protocol error: Invalid request (edits.[0].range: object expected; edits.[0].text: string value expected; edits.[2].styleSheetId: string value expected)
 
 Running test: testMalformedArguments3
-Expected protocol error: Some arguments of method 'CSS.setStyleTexts' can't be processed (edits.[0].range.startLine: integer value expected)
+Expected protocol error: Invalid request (edits.[0].range.startLine: integer value expected)
 
 Running test: testFirstEditDoesNotApply
 Expected protocol error: Failed applying edit #0: SyntaxError Style text is not valid.
 
 Running test: testSecondEditDoesNotApply
 Expected protocol error: Failed applying edit #1: SyntaxError Style text is not valid.
 
 Running test: testBasicSetStyle
 ==== Style sheet text ====
 #test {
@@ skipping 63 matching lines @@
         content: 'EDITED4';
 }
 
     #test {
         content: 'EDITED5';
 }
 }