Fix string escaping in CollapseProperties warning
@@ -81,7 +81,7 @@ class CollapseProperties implements CompilerPass {
static final DiagnosticType UNSAFE_THIS = DiagnosticType.warning(
"JSC_UNSAFE_THIS",
- "dangerous use of 'this' in static method {0}");
+ "dangerous use of ''this'' in static method {0}");
private AbstractCompiler compiler;
