[strong] Less pleading error messages

R=dslomov@chromium.org
BUG=v8:3956
LOG=N

Review URL: https://codereview.chromium.org/1021213002

Cr-Commit-Position: refs/heads/master@{#27338}

src/messages.js

@@ -164,19 +164,19 @@ var kMessages = {
   strict_cannot_assign:          ["Cannot assign to read only '", "%0", "' in strict mode"],
   strict_poison_pill:            ["'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them"],
   strict_caller:                 ["Illegal access to a strict mode caller function."],
-  strong_ellision:               ["Please don't use arrays with holes in strong mode, use maps instead"],
-  strong_arguments:              ["Please don't use 'arguments' in strong mode, use '...args' instead"],
-  strong_equal:                  ["Please don't use '==' or '!=' in strong mode, use '===' or '!==' instead"],
-  strong_delete:                 ["Please don't use 'delete' in strong mode, use maps or sets instead"],
-  strong_var:                    ["Please don't use 'var' in strong mode, use 'let' or 'const' instead"],
-  strong_for_in:                 ["Please don't use 'for'-'in' loops in strong mode, use 'for'-'of' instead"],
-  strong_empty:                  ["Please don't use empty sub-statements in strong mode, make them explicit with '{}' instead"],
-  strong_use_before_declaration: ["Please declare variable '", "%0", "' before use in strong mode"],
-  strong_super_call_missing:     ["Please always invoke the super constructor in subclasses in strong mode"],
-  strong_super_call_duplicate:   ["Please don't invoke the super constructor multiple times in strong mode"],
-  strong_super_call_nested:      ["Please don't invoke the super constructor nested inside another statement or expression in strong mode"],
-  strong_constructor_return_value: ["Please do not return a value from a constructor in strong mode"],
-  strong_constructor_return_misplaced: ["Please do not return from a constructor before its super constructor invocation in strong mode"],
+  strong_ellision:               ["In strong mode, arrays with holes are deprecated, use maps instead"],
+  strong_arguments:              ["In strong mode, 'arguments' is deprecated, use '...args' instead"],
+  strong_equal:                  ["In strong mode, '==' and '!=' are deprecated, use '===' and '!==' instead"],
+  strong_delete:                 ["In strong mode, 'delete' is deprecated, use maps or sets instead"],
+  strong_var:                    ["In strong mode, 'var' is deprecated, use 'let' or 'const' instead"],
+  strong_for_in:                 ["In strong mode, 'for'-'in' loops are deprecated, use 'for'-'of' instead"],
+  strong_empty:                  ["In strong mode, empty sub-statements are deprecated, make them explicit with '{}' instead"],
+  strong_use_before_declaration: ["In strong mode, declaring variable '", "%0", "' before its use is required"],
+  strong_super_call_missing:     ["In strong mode, invoking the super constructor in a subclass is required"],
+  strong_super_call_duplicate:   ["In strong mode, invoking the super constructor multiple times is deprecated"],
+  strong_super_call_nested:      ["In strong mode, invoking the super constructor nested inside another statement or expression is deprecated"],
+  strong_constructor_return_value: ["In strong mode, returning a value from a constructor is deprecated"],
+  strong_constructor_return_misplaced: ["In strong mode, returning from a constructor before its super constructor invocation is deprecated"],
   sloppy_lexical:                ["Block-scoped declarations (let, const, function, class) not yet supported outside strict mode"],
   malformed_arrow_function_parameter_list: ["Malformed arrow function parameter list"],
   generator_poison_pill:         ["'caller' and 'arguments' properties may not be accessed on generator functions."],