Revert of Delay font cache building by few seconds to yield for startup...

Revert of Delay font cache building by few seconds to yield for startup resource contention. (patchset #3 id:40001 of https://codereview.chromium.org/992413003/)

Reason for revert:
Suspected to be causing failures on Intel Release GPU bot.

See crbug.com/467706

Original issue's description:
> Delay font cache building by few seconds to yield for startup resource contention.
>
> During first renderer start there are lot of things happening simultaneously some of them are:
> 1. Renderer is going through all font files on the system to create a font collection.
> 2. Renderer loading up startup URL, accessing HTML/JS File cache, net activity etc.
> 3. Extension initialization.
>
> We delay building of this cache mainly to avoid parallel font file loading along with Renderer. Some systems have significant number of font files which takes long time process.
>
> BUG=458751,436195
> R=cpu,scottmg
>
> Committed: https://crrev.com/787e29c61825173adaf3414ff8e3d3c0c26f529b
> Cr-Commit-Position: refs/heads/master@{#320226}

TBR=cpu@chromium.org,scottmg@chromium.org,gab@chromium.org,shrikant@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=458751,436195

Review URL: https://codereview.chromium.org/1009403004

Cr-Commit-Position: refs/heads/master@{#320811}

chrome/browser/chrome_browser_main_win.cc

@@ -291,26 +291,9 @@ void ChromeBrowserMainPartsWin::PostProfileInit() {
     // otherwise it will spawn utility process to build cache file, which will
     // be used during next browser start/postprofileinit.
     if (!content::LoadFontCache(path)) {
-      // We delay building of font cache until first startup page loads.
-      // Selected 5 seconds as delay based on 50th percentile value
-      // for Startup.FirstWebContents.NonEmptyPaint.
-      // During first renderer start there are lot of things happening
-      // simultaneously some of them are:
-      // - Renderer is going through all font files on the system to create
-      //   a font collection.
-      // - Renderer loading up startup URL, accessing HTML/JS File cache,
-      //   net activity etc.
-      // - Extension initialization.
-      // We delay building of cache mainly to avoid parallel font file
-      // loading along with Renderer. Some systems have significant number of
-      // font files which takes long time to process.
-      // Related information is at http://crbug.com/436195.
-      const int kBuildFontCacheDelaySec = 5;
-      content::BrowserThread::PostDelayedTask(
-          content::BrowserThread::IO,
-          FROM_HERE,
-          base::Bind(ExecuteFontCacheBuildTask, path),
-          base::TimeDelta::FromSeconds(kBuildFontCacheDelaySec));
+      content::BrowserThread::PostTask(
+          content::BrowserThread::IO, FROM_HERE,
+          base::Bind(ExecuteFontCacheBuildTask, path));
     }
   }
 }