Restore one millisecond minimum timeout for setTimeout.

This reverts the non-test part of https://codereview.chromium.org/2738773004/
but leaves most of the test changes in place since they should now work
regardless of the setTimeout behaviour.

BUG=711044

Review-Url: https://codereview.chromium.org/2853493002
Cr-Commit-Position: refs/heads/master@{#467962}

third_party/WebKit/LayoutTests/http/tests/security/mixedContent/insecure-plugin-in-iframe-expected.txt

-CONSOLE WARNING: line 5: Mixed Content: The page at 'https://127.0.0.1:8443/security/mixedContent/resources/frame-with-insecure-plugin.html' was loaded over HTTPS, but requested an insecure plugin resource 'http://example.test:8000/security/mixedContent/resources/dummy.swf'. This content should also be served over HTTPS.
+CONSOLE WARNING: Mixed Content: The page at 'https://127.0.0.1:8443/security/mixedContent/resources/frame-with-insecure-plugin.html' was loaded over HTTPS, but requested an insecure plugin resource 'http://example.test:8000/security/mixedContent/resources/dummy.swf'. This content should also be served over HTTPS.
 CONSOLE MESSAGE: Blink Test Plugin: initializing
 This test loads a secure iframe that loads an insecure plugin. We should get a mixed content callback because the insecure plugin can script the secure origin.
 

third_party/WebKit/Source/core/frame/DOMTimer.cpp

@@ -88,10 +88,8 @@ DOMTimer::DOMTimer(ExecutionContext* context,
     user_gesture_token_ = UserGestureIndicator::CurrentToken();
   }
 
-  // TODO(delphick): Remove the single shot guard here so that this affects
-  // setInterval as well.
   double interval_milliseconds =
-      std::max(single_shot ? 0.0 : kOneMillisecond, interval * kOneMillisecond);
+      std::max(kOneMillisecond, interval * kOneMillisecond);
   if (interval_milliseconds < kMinimumInterval &&
       nesting_level_ >= kMaxTimerNestingLevel)
     interval_milliseconds = kMinimumInterval;

third_party/WebKit/Source/core/frame/DOMTimerTest.cpp

@@ -87,7 +87,7 @@ const char* const kSetTimeout0ScriptText =
     "}"
     "setTimeout(setTimeoutCallback, 0);";
 
-TEST_F(DOMTimerTest, setTimeout_ZeroIsNotClampedToOne) {
+TEST_F(DOMTimerTest, DISABLED_setTimeout_ZeroIsNotClampedToOne) {
   v8::HandleScope scope(v8::Isolate::GetCurrent());
 
   ExecuteScriptAndWaitUntilIdle(kSetTimeout0ScriptText);