Set 5M memory for OutOfMemory and OutOfMemoryNested test cases.

BUG=
TEST=cctest/test-api/OutOfMemory
     cctest/test-api/OutOfMemoryNested

Review URL: https://codereview.chromium.org/18688002
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15494 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-api.cc

@@ -3715,7 +3715,7 @@ TEST(OutOfMemory) {
   static const int K = 1024;
   v8::ResourceConstraints constraints;
   constraints.set_max_young_space_size(256 * K);
-  constraints.set_max_old_space_size(4 * K * K);
+  constraints.set_max_old_space_size(5 * K * K);
   v8::SetResourceConstraints(&constraints);
 
   // Execute a script that causes out of memory.
@@ -3756,7 +3756,7 @@ TEST(OutOfMemoryNested) {
   static const int K = 1024;
   v8::ResourceConstraints constraints;
   constraints.set_max_young_space_size(256 * K);
-  constraints.set_max_old_space_size(4 * K * K);
+  constraints.set_max_old_space_size(5 * K * K);
   v8::SetResourceConstraints(&constraints);
 
   v8::HandleScope scope(v8::Isolate::GetCurrent());