Remove use of toTitleCase in layout tests

It's a method that's added to the String prototype by DevTools frontend,
but we are removing that in a CL [1]. The layout tests need to be
updated to not depend on it. They don't need the expression to be in
title case so we'll just change the tests to use the expression as is.

[1]: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2193590

Change-Id: I7ac36003423ded30ec42072a0667d66af590215c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2195962
Commit-Queue: Jack Franklin <jacktfranklin@chromium.org>
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#767773}

third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/function-generator-details-expected.txt

 Tests that Debugger.getGeneratorObjectDetails command returns correct result.
 
 
-Running: testIterNotStarted
+Running: testiterNotStarted
 iterNotStarted: type = object, subtype = generator
 lineNumber = 17
 columnNumber = 19
@@ -16,7 +16,7 @@ script is valid: yes
 [[GeneratorReceiver]] = Window
 [[Scopes]] = Scopes[2]
 
-Running: testIterSuspended
+Running: testiterSuspended
 iterSuspended: type = object, subtype = generator
 lineNumber = 19
 columnNumber = 10
@@ -31,7 +31,7 @@ script is valid: yes
 [[GeneratorReceiver]] = Window
 [[Scopes]] = Scopes[2]
 
-Running: testIterClosed
+Running: testiterClosed
 iterClosed: type = object, subtype = generator
 lineNumber = 17
 columnNumber = 19
@@ -45,7 +45,7 @@ script is valid: yes
       }
 [[GeneratorReceiver]] = Window
 
-Running: testIterObjGenerator
+Running: testiterObjGenerator
 iterObjGenerator: type = object, subtype = generator
 lineNumber = 28
 columnNumber = 14
@@ -60,7 +60,7 @@ script is valid: yes
 [[GeneratorReceiver]] = Object
 [[Scopes]] = Scopes[2]
 
-Running: testAnonymousGenIter
+Running: testanonymousGenIter
 anonymousGenIter: type = object, subtype = generator
 lineNumber = 42
 columnNumber = 10

third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/function-generator-details.js

@@ -86,7 +86,7 @@
   ];
 
   function createTestSuiteFunction(expression) {
-    var functionName = 'test' + expression.toTitleCase();
+    var functionName = 'test' + expression;
     return eval(
         'function ' + functionName + '(next)\n' +
         '{\n' +

third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/show-generator-location-expected.txt

 Tests that "Show Generator Location" jumps to the correct location.
 
 
-Running: testIterNotStarted
+Running: testiterNotStarted
 Generator location revealed: [17:20]
 
-Running: testIterSuspended1
+Running: testiterSuspended1
 Generator location revealed: [19:11]
 
-Running: testIterSuspended2
+Running: testiterSuspended2
 Generator location revealed: [20:11]
 
-Running: testIterSuspended3
+Running: testiterSuspended3
 Generator location revealed: [21:11]
 
-Running: testIterClosed
+Running: testiterClosed
 Generator location revealed: [17:20]
 

third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/show-generator-location.js

@@ -66,7 +66,7 @@
   ];
 
   function createTestSuiteFunction(expression) {
-    var functionName = 'test' + expression.toTitleCase();
+    var functionName = 'test' + expression;
     return eval(
         'function ' + functionName + '(next)\n' +
         '{\n' +