bindings: Remove ToInteger() from WebFrameTest
bindings: Remove ToInteger() from WebFrameTest

Since we can replace ToInteger() with As<v8::Int32>(). This CL removes
ToInteger() use except for ScriptDebugger.

BUG=462402

Review URL: https://codereview.chromium.org/1067193003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@193343 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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