Dropping --nacl-loader-cmd-prefix

The --nacl-loader-cmd-prefix is no longer useful in practice for injecting a
debugger after this:
https://code.google.com/p/chromium/issues/detail?id=118263
https://src.chromium.org/viewvc/chrome?view=rev&revision=230891

We should drop the switch from chromium.

BUG=350158
TEST=None
NOTRY=true

Review URL: https://codereview.chromium.org/189623003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255782 0039d316-1c4b-4281-b951-d872f2087c98
Add a histogram to track the number of QUIC packets received by a QUIC
connection whose handshake was not confirmed when that connection is
closed.

Review URL: https://codereview.chromium.org/183853028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255783 0039d316-1c4b-4281-b951-d872f2087c98
Remove DeferredResourceLoadingTest's use of *named* shared memory.

It's totally unnecessary (and named shared memory is now deprecated).

R=jam@chromium.org

Review URL: https://codereview.chromium.org/189843009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255784 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255784
Remove 'writable:false' from webview.request's definition since false is
default for writable.

BUG=None
Test=No visible change, cleanup only.
Updated and ran
browser_tests:WebViewTest.Shim_TestWebRequestAPIExistence

Review URL: https://codereview.chromium.org/190483002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255785 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255785
Remove --pnacl-dir override flag.

It was added in case a test harness needed to point at 
a mock PNaCl component, but that can be done without
the commandline switch.

BUG=none (flags cleanup)

Review URL: https://codereview.chromium.org/189853002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255786 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255786