Fix cpplint warnings.

Fix cpplint warnings.

Fixes:
base/android/linker/linker_jni.cc:300:  Single-parameter constructors should be marked explicit.  [runtime/explicit] [5]
base/android/linker/linker_jni.cc:313:  Weird number of spaces at line-start.  Are you using a 2-space indent?  [whitespace/indent] [3]
base/android/linker/linker_jni.cc:319:  Weird number of spaces at line-start.  Are you using a 2-space indent?  [whitespace/indent] [3]
base/android/linker/linker_jni.cc:320:  Weird number of spaces at line-start.  Are you using a 2-space indent?  [whitespace/indent] [3]

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289642

[Anton, 2014-08-14 10:19:49]

On 2014/08/14 10:14:54, simonb wrote:

lgtm, though I am not a committer so you will still need someone else.

[simonb (inactive), 2014-08-14 10:34:35]

For owner/committer review.  Thanks.

[rmcilroy, 2014-08-14 12:08:30]

On 2014/08/14 10:34:35, simonb wrote:
> For owner/committer review.  Thanks.

lgtm, thanks.

[simonb (inactive), 2014-08-14 12:40:07]

The CQ bit was checked by simonb@chromium.org

[commit-bot: I haz the power, 2014-08-14 12:43:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/simonb@chromium.org/470943002/1

[commit-bot: I haz the power, 2014-08-14 17:29:25]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)
  linux_chromium_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[commit-bot: I haz the power, 2014-08-14 17:45:23]

Committed patchset #1 (1) as 289642