Remove reset from contructor of TestInterfaces.

Objects are all set up in a reasonable state at construction time
already. No need to do a Reset, which also involves some IPCs back up
to the browser.

Change-Id: Ic4522f40bce99178c838d268af8499d36b0e5325
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128240Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754653}

content/shell/test_runner/test_interfaces.cc

@@ -33,8 +33,6 @@ TestInterfaces::TestInterfaces()
   blink::SetWebTestMode(true);
   // NOTE: please don't put feature specific enable flags here,
   // instead add them to runtime_enabled_features.json5
-
-  ResetAll();
 }
 
 TestInterfaces::~TestInterfaces() {