Cause mini_installer tests to noop on component builds.

chrome/installer/mini_installer/mini_installer.cc

Index: chrome/installer/mini_installer/mini_installer.cc
diff --git a/chrome/installer/mini_installer/mini_installer.cc b/chrome/installer/mini_installer/mini_installer.cc
index 28a8057627e67353dc4fb8d737337f467ea22a56..728e7f8818459a02a080ae4f0b55af9f75fe27ef 100644
--- a/chrome/installer/mini_installer/mini_installer.cc
+++ b/chrome/installer/mini_installer/mini_installer.cc
@@ -752,12 +752,14 @@ bool ShouldDeleteExtractedFiles() {
 // executes setup.exe to do the install/upgrade.
 int WMain(HMODULE module) {
 #if defined(COMPONENT_BUILD)
-  static const wchar_t kComponentBuildIncompatibleMessage[] =
-      L"mini_installer.exe is incompatible with the component build, please run"
-      L" setup.exe with the same command line instead. See"
-      L" http://crbug.com/127233#c17 for details.";
-  ::MessageBox(NULL, kComponentBuildIncompatibleMessage, NULL, MB_ICONERROR);
-  return 1;
+  if (::GetEnvironmentVariable(L"MINI_INSTALLER_TEST", NULL, 0) == 0) {
+    static const wchar_t kComponentBuildIncompatibleMessage[] =
+        L"mini_installer.exe is incompatible with the component build, please"
+        L" run setup.exe with the same command line instead. See"
+        L" http://crbug.com/127233#c17 for details.";
+    ::MessageBox(NULL, kComponentBuildIncompatibleMessage, NULL, MB_ICONERROR);
+    return 1;
+  }
 #endif
 
   // Always start with deleting potential leftovers from previous installations.
@@ -775,6 +777,17 @@ int WMain(HMODULE module) {
   if (!configuration.Initialize())
     return exit_code;
 
+  if (configuration.query_component_build()) {
+    // Exit immediately with an exit code of 1 to indicate component build and 0
+    // to indicate static build. This is used by the tests in
+    // /src/chrome/test/mini_installer/.
+#if defined(COMPONENT_BUILD)
+    return 1;
+#else
+    return 0;
+#endif
+  }
+
   // If the --cleanup switch was specified on the command line, then that means
   // we should only do the cleanup and then exit.
   if (ProcessNonInstallOperations(configuration, &exit_code))