Revert of replace COMPILE_ASSERT with static_assert in chrome/installer/

chrome/installer/mini_installer/mini_string.h

Index: chrome/installer/mini_installer/mini_string.h
diff --git a/chrome/installer/mini_installer/mini_string.h b/chrome/installer/mini_installer/mini_string.h
index c97817cce7954d3ccb344f9aadefc3db6f5dbec7..c32f78a127f81e26f1839eb833765383c4fec223 100644
--- a/chrome/installer/mini_installer/mini_string.h
+++ b/chrome/installer/mini_installer/mini_string.h
@@ -5,6 +5,13 @@
 #ifndef CHROME_INSTALLER_MINI_INSTALLER_MINI_STRING_H_
 #define CHROME_INSTALLER_MINI_INSTALLER_MINI_STRING_H_
 
+#ifndef COMPILE_ASSERT
+// COMPILE_ASSERT macro borrowed from basictypes.h
+template <bool>
+struct CompileAssert {};
+#define COMPILE_ASSERT(expr, msg) \
+    typedef CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
+#endif
 
 namespace mini_installer {
 
@@ -65,7 +72,7 @@
 class StackString {
  public:
   StackString() {
-    static_assert(kCapacity != 0, "invalid buffer size");
+    COMPILE_ASSERT(kCapacity != 0, invalid_buffer_size);
     buffer_[kCapacity] = L'\0';  // We always reserve 1 more than asked for.
     clear();
   }