[cleanup] Replace deprecated V8 functions in Translate.

Use As<Boolean>/<Integer>/<Number> instead of deprecated Value::BooleanValue/IntegerValue/
NumberValue.

BUG=v8:7786

Change-Id: I4123b5e135b58d3b6a88da6eec3fa8634dd06b5c
Reviewed-on: https://chromium-review.googlesource.com/1158406
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579808}

chrome/renderer/translate/translate_script_browsertest.cc

@@ -123,7 +123,7 @@ class TranslateScriptBrowserTest : public ChromeRenderViewTest {
       // TranslateHelper::ExecuteScriptAndGetDoubleResult().
       return 0.0;
     }
-    return result->NumberValue();
+    return result.As<v8::Number>()->Value();
   }
 
   bool ExecuteScriptAndGetBoolResult(const std::string& script) {
@@ -136,7 +136,7 @@ class TranslateScriptBrowserTest : public ChromeRenderViewTest {
       NOTREACHED();
       return false;
     }
-    return result->BooleanValue();
+    return result.As<v8::Boolean>()->Value();
   }
 
   DISALLOW_COPY_AND_ASSIGN(TranslateScriptBrowserTest);

components/translate/content/renderer/translate_helper.cc

@@ -213,7 +213,7 @@ bool TranslateHelper::ExecuteScriptAndGetBoolResult(const std::string& script,
     return fallback;
   }
 
-  return result->BooleanValue();
+  return result.As<v8::Boolean>()->Value();
 }
 
 std::string TranslateHelper::ExecuteScriptAndGetStringResult(
@@ -254,7 +254,7 @@ double TranslateHelper::ExecuteScriptAndGetDoubleResult(
     return 0.0;
   }
 
-  return result->NumberValue();
+  return result.As<v8::Number>()->Value();
 }
 
 int64_t TranslateHelper::ExecuteScriptAndGetIntegerResult(
@@ -272,7 +272,7 @@ int64_t TranslateHelper::ExecuteScriptAndGetIntegerResult(
     return 0;
   }
 
-  return result->IntegerValue();
+  return result.As<v8::Integer>()->Value();
 }
 
 // mojom::Page implementations.