Make the strict-mode calling convention for contextual calls the default one.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 4d7c1a250547b4c1ad2ddf0640379f26e5f40eaa..3bf4db5780a31d041782b3f0aaf30d046ee5151b 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -102,6 +102,13 @@ class CompilationInfo {
     ASSERT(IsStub());
     parameter_count_ = parameter_count;
   }
+
+  void set_this_has_uses(bool has_no_uses) {
+    this_has_uses_ = has_no_uses;
+  }
+  bool this_has_uses() {
+    return this_has_uses_;
+  }
   void SetLanguageMode(LanguageMode language_mode) {
     ASSERT(this->language_mode() == CLASSIC_MODE ||
            this->language_mode() == language_mode ||
@@ -441,6 +448,8 @@ class CompilationInfo {
   // Number of parameters used for compilation of stubs that require arguments.
   int parameter_count_;
 
+  bool this_has_uses_;
+
   Handle<Foreign> object_wrapper_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);